test(contract): v1.4.0 快照四模块同步 + 用户资料与头像矩阵入场（T3.5-07）

doc 仓正典 main@5f02909 冻结 v1.4.0 后的 api 侧收尾：字节级同步快照、守卫
升版、新增/变更操作入契约一致性矩阵。**零生产代码改动**（只改契约快照与测试）。

快照同步（字节级，md5 与正典逐一比对一致 a7081fb84f1207eef579ab94025f5801）：
- 四模块 openapi-v1.3.0.yaml → openapi-v1.4.0.yaml，删旧文件（守卫只认一份，
  保留旧快照是死重；历史版本由 git 与 doc 仓承载，沿 T3-19 先例）
- 四份守卫期望升版：1.3.0/31/43/72 → 1.4.0/32/45/75

矩阵扩展（173 → 181 格，豁免仍为 1 格）：
- patbond-auth +5 格：PATCH /api/v1/me 全响应矩阵（200 设值 / 200 显式 null
  清空 / 400 空 patch / 401 / 404 双码 40400+40405 / 422 42203），并让 GET
  /api/v1/me 在 nickname 非空分支再走一遍严格校验。注意 /api/v1/me 的守卫与
  矩阵都在 auth 模块（实现在 user，契约测试跨服务发请求），扩契约易漏
- patbond-pet +1 格：PATCH /api/v1/pets/{petId} 新增 422/42203；404 单元格
  补 40405 第二种业务码（幽灵 asset 与用途不符 asset 合并同答），并补一格
  挂 ready 头像的 200
- patbond-community +2 格：GET /api/v1/me/community-stats 200（空数据零值与
  有数据 1 赞/2 作品两分支）+ 401（由全操作循环覆盖）
- patbond-user media 域 2 操作 8 格不变（v1.4.0 未触碰其冻结面）

T3.5-04/05/06 遗留的 11 格契约守卫红（auth 2 + pet 9，根因为新增字段未冻结）
全部转绿。测试 379 → 381（+2 个新增矩阵方法），根反应堆 clean test 全绿，
check-secrets.sh --all exit 0。

mutation 自证（三处定向注毒均红、还原即绿）：CommunityStats.required 注入
fakeStatsField → GET /me/community-stats 200 报漂移；Me.required 注入
fakeMeField → GET+PATCH /me 200 报漂移；Pet.required 注入 fakePetAvatarField
→ POST /pets 201 等 9 格报漂移。

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -0,0 +1,55 @@
+# Gitea Actions 门禁：与 docs/development/git-workflow.md 的本地门禁完全同一条命令。
+#
+# 启用前提（服务器侧，一次性）：
+#   1. Gitea ≥ 1.19 且管理端开启 Actions（app.ini: [actions] ENABLED=true，
+#      仓库 Settings → Actions 启用）。
+#   2. 注册一个 act_runner，且 runner 所在主机具备：
+#      - Docker（Testcontainers 需要，跑 postgres:18 一次性容器）
+#      - 标签 ubuntu-latest 映射到含 bash/git 的镜像，或 host 模式执行
+#   3. 服务器无法访问 github.com：本工作流不引用任何外部 action——
+#      checkout 手动从本 Gitea 实例克隆，JDK 用 apt 安装，全链路无 GitHub 依赖。
+#
+# 未启用 Actions 时本文件无副作用。
+name: CI
+
+on:
+  push:
+    branches: [dev]
+  pull_request:
+
+# 同分支连推多个提交时，自动取消旧的排队/进行中 run，只跑最新
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  backend-test:
+    runs-on: ubuntu-latest
+    steps:
+      # 不用 actions/checkout：Gitea 1.20+ 的 DEFAULT_ACTIONS_URL 仅接受
+      # github/self，自定义镜像源不生效，action 会回落到 github.com（服务器不可达）。
+      # 改为手动从本 Gitea 实例克隆，零外部依赖。
+      - name: Checkout (manual)
+        run: |
+          git init -q .
+          AUTH_URL=$(echo "${{ github.server_url }}" | sed "s#https://#https://oauth2:${{ github.token }}@#")
+          git remote add origin "$AUTH_URL/${{ github.repository }}.git"
+          git fetch -q --depth 1 origin "+${{ github.ref }}:refs/ci-head"
+          git checkout -q refs/ci-head
+      # 凭证防泄漏兜底（ADR-021）：与本地 pre-commit 同一脚本、同一规则表，
+      # 扫全部已跟踪文件（覆盖本次 push 变更的超集），纯 shell 零外部依赖。
+      - name: Secret scan
+        run: sh scripts/check-secrets.sh --all
+      # 不用 actions/setup-java：它从 github.com 下载 JDK 二进制，
+      # 服务器无法访问 GitHub（实测 ETIMEDOUT）。改用 apt 装 OpenJDK 17，
+      # 并优先切换到腾讯云镜像源（runner 在腾讯云，内网加速）。
+      - name: Install JDK 17 via apt
+        run: |
+          sed -i 's|http://archive.ubuntu.com|https://mirrors.cloud.tencent.com|g; s|http://security.ubuntu.com|https://mirrors.cloud.tencent.com|g' /etc/apt/sources.list 2>/dev/null || true
+          sed -i 's|http://archive.ubuntu.com|https://mirrors.cloud.tencent.com|g; s|http://security.ubuntu.com|https://mirrors.cloud.tencent.com|g' /etc/apt/sources.list.d/*.sources 2>/dev/null || true
+          apt-get update -qq
+          apt-get install -y -qq --no-install-recommends openjdk-17-jdk-headless
+          echo "JAVA_HOME=/usr/lib/jvm/java-17-openjdk-amd64" >> "$GITHUB_ENV"
+          java -version
+      # 与本地门禁同一命令；BUILD SUCCESS 且 0 失败方可合入（git-workflow.md）
+      - run: ./mvnw -B clean test

.gitignore

@@ -9,3 +9,7 @@ target/
 # Local service configuration (copy the committed .sample to application.yml)
 patbond-*/src/main/resources/application.yml
 !patbond-*/src/main/resources/application.yml.sample
+
+# Docker compose 本地机密（deploy/init-secrets.sh 生成，绝不入库）
+.env
+deploy/keys/

Readme.md

@@ -7,13 +7,14 @@ Patbond API is a Spring Boot multi-module backend.
 - `patbond-common`: stable cross-module contracts (response wrapper, shared DTOs). No web/messaging dependencies.
 - `patbond-user`: user service for user creation, profile lookup, and password verification.
 - `patbond-auth`: authentication service for registration and login. Calls `patbond-user` over HTTP via OpenFeign with a configured static URL (no service discovery in the MVP, see ADR-002).
+- `patbond-pet`: pet profile and health record service (M2, ADR-009). Shares the database with `patbond-user` and only reads/writes the `pet_health` schema; the Flyway migration chain stays owned by `patbond-user`. First-wave skeleton: liveness endpoint only.
 
 ## Technology Stack
 
 - Java 17 (build baseline; use JDK 17 for release builds)
 - Spring Boot 3.5.16
 - Spring Cloud 2025.0.3 (OpenFeign only)
-- PostgreSQL 18 + Flyway (patbond-user owns the `identity`/`media` schemas)
+- PostgreSQL 18 + Flyway (patbond-user owns the migration chain: `identity`/`media`/`platform`/`pet_health` schemas)
 - Maven (use the committed Maven Wrapper `./mvnw`)
 
 ## Build and Test
@@ -49,6 +50,8 @@ cp patbond-user/src/main/resources/application.yml.sample \
   patbond-user/src/main/resources/application.yml
 cp patbond-auth/src/main/resources/application.yml.sample \
   patbond-auth/src/main/resources/application.yml
+cp patbond-pet/src/main/resources/application.yml.sample \
+  patbond-pet/src/main/resources/application.yml
 ```
 
 Install the shared module once, then run each service in its own terminal:
@@ -103,6 +106,34 @@ curl -X POST http://127.0.0.1:8081/api/v1/auth/register \
 Machine-specific values live in the git-ignored `application.yml` (copied from the
 committed `.sample`); never commit secrets to the samples.
 
+## Docker Compose
+
+MVP 编排（ADR-007）：`postgres:18`（数据落 volume）+ 两个无状态应用容器。
+配置与本机运行同一套约定 —— 容器内挂载 `application.yml.sample` 作为配置，
+`PATBOND_*` 环境变量注入实际值。
+
+```bash
+# 1. 生成 RS256 密钥对与 .env（DB 口令、内部令牌；产物被 .gitignore 忽略）
+./deploy/init-secrets.sh
+
+# 2. 构建可执行 jar
+JAVA_HOME=/usr/lib/jvm/java-17-openjdk ./mvnw -DskipTests package
+
+# 3. 启动（首次会构建镜像）
+docker compose up -d --build
+
+# 冒烟
+curl -s -X POST http://127.0.0.1:8081/api/v1/auth/register \
+  -H 'Content-Type: application/json' \
+  -d '{"username":"demo_user","password":"secret123"}'
+
+# 停止（-v 同时删除数据库数据）
+docker compose down
+```
+
+注意：数据库端口不对宿主机发布；`8082`（user）在 MVP 阶段直连暴露以提供
+`/api/v1/me`，`/internal/**` 由服务间令牌保护，规模化阶段应改由网关统一入口。
+
 ## Services
 
 ### Auth Service

deploy/init-secrets.sh

@@ -0,0 +1,37 @@
+#!/usr/bin/env bash
+# 生成 docker compose 运行所需的本地机密：RS256 密钥对 + .env（DB 口令、内部令牌）。
+# 产物全部被 .gitignore 忽略，绝不入库；重复执行是幂等的（已存在则不覆盖）。
+set -euo pipefail
+cd "$(dirname "$0")/.."
+
+mkdir -p deploy/keys
+if [ ! -f deploy/keys/jwt-private.pem ]; then
+  openssl genpkey -algorithm RSA -pkeyopt rsa_keygen_bits:2048 -out deploy/keys/jwt-private.pem
+  echo "已生成 deploy/keys/jwt-private.pem"
+fi
+openssl pkey -in deploy/keys/jwt-private.pem -pubout -out deploy/keys/jwt-public.pem
+echo "已生成 deploy/keys/jwt-public.pem"
+
+if [ ! -f .env ]; then
+  {
+    echo "PATBOND_DB_PASSWORD=$(openssl rand -hex 16)"
+    echo "PATBOND_INTERNAL_TOKEN=$(openssl rand -hex 32)"
+  } > .env
+  echo "已生成 .env（随机 DB 口令与内部令牌）"
+fi
+
+# M3（ADR-016/021）：MinIO 根凭证。按键幂等追加，兼容已有 .env；
+# 凭证只存在于被 gitignore 的 .env 中，绝不入库。
+if ! grep -q '^PATBOND_MINIO_ROOT_USER=' .env; then
+  echo "PATBOND_MINIO_ROOT_USER=patbond-minio-$(openssl rand -hex 4)" >> .env
+  echo "已追加 PATBOND_MINIO_ROOT_USER 到 .env"
+fi
+if ! grep -q '^PATBOND_MINIO_ROOT_PASSWORD=' .env; then
+  echo "PATBOND_MINIO_ROOT_PASSWORD=$(openssl rand -hex 16)" >> .env
+  echo "已追加 PATBOND_MINIO_ROOT_PASSWORD 到 .env"
+fi
+
+# 容器内以 uid 10001 运行，密钥需可读
+chmod 644 deploy/keys/jwt-public.pem deploy/keys/jwt-private.pem
+echo "OK：deploy/keys/ 与 .env 就绪（均已被 .gitignore 忽略）"
+

docker-compose.yml

@@ -0,0 +1,155 @@
+# Patbond MVP 编排（ADR-007）：应用容器无状态，PostgreSQL 数据落 volume。
+# 使用步骤见 Readme.md「Docker Compose」一节：
+#   1) ./deploy/init-secrets.sh        生成 RS256 密钥对与 .env（均不入库）
+#   2) JAVA_HOME=... ./mvnw -DskipTests package
+#   3) docker compose up -d --build
+#
+# 配置来源：容器内挂载各服务的 application.yml.sample 作为配置文件，
+# 其中的 ${PATBOND_*} 占位由下方 environment 注入 —— 与本机运行同一套约定。
+name: patbond
+
+services:
+  postgres:
+    image: postgres:18
+    environment:
+      POSTGRES_DB: ${PATBOND_DB_NAME:-patbond}
+      POSTGRES_USER: ${PATBOND_DB_USER:-patbond}
+      POSTGRES_PASSWORD: ${PATBOND_DB_PASSWORD:?先运行 deploy/init-secrets.sh 生成 .env}
+    volumes:
+      # postgres:18 官方镜像的挂载点是 /var/lib/postgresql（含版本子目录）
+      - pgdata:/var/lib/postgresql
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U ${PATBOND_DB_USER:-patbond} -d ${PATBOND_DB_NAME:-patbond}"]
+      interval: 2s
+      timeout: 3s
+      retries: 30
+    # 数据库不对宿主机发布端口；调试需要时可临时加 ports: ["15432:5432"]
+
+  # M3（ADR-016）：自托管 MinIO 对象存储。镜像 tag 与集成测试的 MinIO
+  # Testcontainer 钉同一版本（三环境零分叉）；对象数据落 volume（ADR-007，
+  # 应用容器保持无状态）。桶初始化由 user 服务启动时执行（ensureBucket，
+  # 本地/compose/CI 同一条路径），无需 mc 初始化容器。9000 端口必须对客户端
+  # 可达：预签名直传/读取 URL 都直接指向 MinIO，不经应用服务器。
+  minio:
+    image: minio/minio:RELEASE.2025-04-22T22-12-26Z
+    command: server /data
+    environment:
+      MINIO_ROOT_USER: ${PATBOND_MINIO_ROOT_USER:?先运行 deploy/init-secrets.sh 生成 .env}
+      MINIO_ROOT_PASSWORD: ${PATBOND_MINIO_ROOT_PASSWORD:?先运行 deploy/init-secrets.sh 生成 .env}
+    volumes:
+      - minio-data:/data
+    healthcheck:
+      test: ["CMD-SHELL", "curl -sf http://127.0.0.1:9000/minio/health/live"]
+      interval: 2s
+      timeout: 3s
+      retries: 30
+    ports:
+      - "${PATBOND_MINIO_PORT:-9000}:9000"
+
+  user:
+    build: ./patbond-user
+    environment:
+      SPRING_CONFIG_LOCATION: file:/config/application.yml
+      PATBOND_DB_URL: jdbc:postgresql://postgres:5432/${PATBOND_DB_NAME:-patbond}
+      PATBOND_DB_USER: ${PATBOND_DB_USER:-patbond}
+      PATBOND_DB_PASSWORD: ${PATBOND_DB_PASSWORD:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_INTERNAL_TOKEN: ${PATBOND_INTERNAL_TOKEN:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_JWT_PUBLIC_KEY: /run/patbond/keys/jwt-public.pem
+      # ADR-016/017：media 上传流程在 user 服务。服务自身走内网端点；
+      # 预签名 URL 按 PATBOND_MINIO_PUBLIC_ENDPOINT 签发（默认本机回环，
+      # 真机联调/生产改为客户端可达地址）。
+      PATBOND_MINIO_ENDPOINT: http://minio:9000
+      PATBOND_MINIO_PUBLIC_ENDPOINT: ${PATBOND_MINIO_PUBLIC_ENDPOINT:-http://127.0.0.1:9000}
+      PATBOND_MINIO_ACCESS_KEY: ${PATBOND_MINIO_ROOT_USER:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_MINIO_SECRET_KEY: ${PATBOND_MINIO_ROOT_PASSWORD:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_MINIO_BUCKET: ${PATBOND_MINIO_BUCKET:-patbond-media}
+    volumes:
+      - ./patbond-user/src/main/resources/application.yml.sample:/config/application.yml:ro
+      - ./deploy/keys:/run/patbond/keys:ro
+    # MVP 直连暴露 8082 供客户端访问 /api/v1/me；/internal/** 已有服务间鉴权，
+    # 规模化阶段应由网关统一入口并停止直接暴露本端口。
+    ports:
+      - "${PATBOND_USER_PORT:-8082}:8082"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      minio:
+        condition: service_healthy
+
+  auth:
+    build: ./patbond-auth
+    environment:
+      SPRING_CONFIG_LOCATION: file:/config/application.yml
+      PATBOND_USER_SERVICE_URL: http://user:8082
+      PATBOND_INTERNAL_TOKEN: ${PATBOND_INTERNAL_TOKEN:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_JWT_PRIVATE_KEY: /run/patbond/keys/jwt-private.pem
+    volumes:
+      - ./patbond-auth/src/main/resources/application.yml.sample:/config/application.yml:ro
+      - ./deploy/keys:/run/patbond/keys:ro
+    ports:
+      - "${PATBOND_AUTH_PORT:-8081}:8081"
+    depends_on:
+      - user
+
+  # M2（ADR-009）：宠物健康档案服务。第二波起提供 /api/v1/pets、/api/v1/breeds
+  # 业务端点（RS256 校验，与 user 同一公钥）。与 user 共库；Flyway 迁移链由
+  # user 服务统一执行，故依赖 user 先起，保证 pet_health schema 已就绪。
+  pet:
+    build: ./patbond-pet
+    environment:
+      SPRING_CONFIG_LOCATION: file:/config/application.yml
+      PATBOND_DB_URL: jdbc:postgresql://postgres:5432/${PATBOND_DB_NAME:-patbond}
+      PATBOND_DB_USER: ${PATBOND_DB_USER:-patbond}
+      PATBOND_DB_PASSWORD: ${PATBOND_DB_PASSWORD:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_JWT_PUBLIC_KEY: /run/patbond/keys/jwt-public.pem
+      # 媒体读取侧（M3.5 T3.5-05）：宠物头像的预签名 GET 与 user 服务同一凭证/
+      # 同一客户端可达地址（本地 SigV4 计算，不直连 MinIO，无需 depends_on minio）。
+      PATBOND_MINIO_PUBLIC_ENDPOINT: ${PATBOND_MINIO_PUBLIC_ENDPOINT:-http://127.0.0.1:9000}
+      PATBOND_MINIO_ACCESS_KEY: ${PATBOND_MINIO_ROOT_USER:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_MINIO_SECRET_KEY: ${PATBOND_MINIO_ROOT_PASSWORD:?先运行 deploy/init-secrets.sh 生成 .env}
+    volumes:
+      - ./patbond-pet/src/main/resources/application.yml.sample:/config/application.yml:ro
+      - ./deploy/keys:/run/patbond/keys:ro
+    ports:
+      - "${PATBOND_PET_PORT:-8083}:8083"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      user:
+        condition: service_started
+
+  # M3（ADR-017）：社区服务（Feed/帖子/评论/互动）。骨架起 /api/v1/** 即接
+  # RS256 校验（与 user/pet 同一公钥）；只读写 community schema。与 user 共库；
+  # Flyway 迁移链（V1..V5，含 community 基线）由 user 服务统一执行，故依赖
+  # user 先起，保证 community schema 已就绪。
+  community:
+    build: ./patbond-community
+    environment:
+      SPRING_CONFIG_LOCATION: file:/config/application.yml
+      PATBOND_DB_URL: jdbc:postgresql://postgres:5432/${PATBOND_DB_NAME:-patbond}
+      PATBOND_DB_USER: ${PATBOND_DB_USER:-patbond}
+      PATBOND_DB_PASSWORD: ${PATBOND_DB_PASSWORD:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_JWT_PUBLIC_KEY: /run/patbond/keys/jwt-public.pem
+      # 作者公开资料（D3-9 方案 B）：走 user 服务 /internal 批量接口，
+      # 服务间共享密钥与 auth/user 同一值。
+      PATBOND_USER_SERVICE_URL: http://user:8082
+      PATBOND_INTERNAL_TOKEN: ${PATBOND_INTERNAL_TOKEN:?先运行 deploy/init-secrets.sh 生成 .env}
+      # 媒体读取侧：帖子响应中图片 URL 的预签名 GET 与 user 服务同一凭证/同一
+      # 客户端可达地址（本地 SigV4 计算，不直连 MinIO，无需 depends_on minio）。
+      PATBOND_MINIO_PUBLIC_ENDPOINT: ${PATBOND_MINIO_PUBLIC_ENDPOINT:-http://127.0.0.1:9000}
+      PATBOND_MINIO_ACCESS_KEY: ${PATBOND_MINIO_ROOT_USER:?先运行 deploy/init-secrets.sh 生成 .env}
+      PATBOND_MINIO_SECRET_KEY: ${PATBOND_MINIO_ROOT_PASSWORD:?先运行 deploy/init-secrets.sh 生成 .env}
+    volumes:
+      - ./patbond-community/src/main/resources/application.yml.sample:/config/application.yml:ro
+      - ./deploy/keys:/run/patbond/keys:ro
+    ports:
+      - "${PATBOND_COMMUNITY_PORT:-8084}:8084"
+    depends_on:
+      postgres:
+        condition: service_healthy
+      user:
+        condition: service_started
+
+volumes:
+  pgdata:
+  minio-data:

patbond-auth/Dockerfile

@@ -0,0 +1,9 @@
+# Runtime image only — build the jar first: ./mvnw -pl patbond-auth -am package
+# Stateless by design (ADR-007): no local state, config via env / mounted files.
+FROM eclipse-temurin:17-jre
+RUN useradd --system --uid 10001 patbond
+USER patbond
+WORKDIR /app
+COPY target/patbond-auth-1.0.0-SNAPSHOT-exec.jar app.jar
+EXPOSE 8081
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]

patbond-auth/pom.xml

@@ -88,6 +88,22 @@
             <plugin>
                 <groupId>org.springframework.boot</groupId>
                 <artifactId>spring-boot-maven-plugin</artifactId>
+                <!-- No spring-boot-starter-parent in this build, so the
+                     executable-jar repackaging must be bound explicitly. -->
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                        <configuration>
+                            <!-- Keep the plain jar as the main artifact so other
+                                 modules can depend on this one (patbond-auth's
+                                 E2E test does); the runnable fat jar gets the
+                                 -exec classifier and is what the Dockerfile ships. -->
+                            <classifier>exec</classifier>
+                        </configuration>
+                    </execution>
+                </executions>
             </plugin>
         </plugins>
     </build>

patbond-auth/src/main/java/com/patbond/patbond/auth/controller/AuthController.java

@@ -53,14 +53,19 @@ public class AuthController {
     }
 
     private AuthService.ClientInfo clientInfo(HttpServletRequest request) {
-        String userAgent = request.getHeader(HttpHeaders.USER_AGENT);
-        if (userAgent != null && userAgent.length() > 512) {
-            userAgent = userAgent.substring(0, 512);
-        }
+        String deviceId = truncate(request.getHeader("X-Device-Id"), 128);
+        String userAgent = truncate(request.getHeader(HttpHeaders.USER_AGENT), 512);
         String forwarded = request.getHeader("X-Forwarded-For");
         String ip = forwarded != null && !forwarded.isBlank()
                 ? forwarded.split(",")[0].trim()
                 : request.getRemoteAddr();
-        return new AuthService.ClientInfo(userAgent, ip);
+        return new AuthService.ClientInfo(deviceId, userAgent, ip);
+    }
+
+    private static String truncate(String value, int maxLength) {
+        if (value == null || value.isBlank()) {
+            return null;
+        }
+        return value.length() > maxLength ? value.substring(0, maxLength) : value;
     }
 }

patbond-auth/src/main/java/com/patbond/patbond/auth/service/AuthService.java

@@ -34,7 +34,7 @@ import java.util.UUID;
 public class AuthService {
 
     /** Device metadata forwarded to the session record (observability only). */
-    public record ClientInfo(String userAgent, String ipAddress) {
+    public record ClientInfo(String deviceId, String userAgent, String ipAddress) {
     }
 
     private final UserClient userClient;
@@ -88,7 +88,8 @@ public class AuthService {
 
     private AuthTokenResponse openSession(UUID userId, ClientInfo clientInfo) {
         SessionTokens tokens = requireData(sessionClient.create(new CreateSessionRequest(
-                userId, clientInfo.userAgent(), clientInfo.ipAddress())), "创建会话失败");
+                userId, clientInfo.deviceId(), clientInfo.userAgent(), clientInfo.ipAddress())),
+                "创建会话失败");
         return assemble(tokens);
     }
 

patbond-auth/src/test/java/com/patbond/patbond/auth/contract/AuthContractConformanceTest.java

@@ -0,0 +1,427 @@
+package com.patbond.patbond.auth.contract;
+
+import com.jayway.jsonpath.JsonPath;
+import com.patbond.patbond.auth.support.SpringTestSupport;
+import com.patbond.patbond.auth.support.TestJwtKeys;
+import com.patbond.patbond.user.UserApplication;
+import io.jsonwebtoken.Jwts;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.MethodOrderer;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.builder.SpringApplicationBuilder;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.boot.test.web.client.TestRestTemplate;
+import org.springframework.context.ConfigurableApplicationContext;
+import org.springframework.http.HttpEntity;
+import org.springframework.http.HttpHeaders;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
+import org.springframework.http.ResponseEntity;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+import org.testcontainers.containers.PostgreSQLContainer;
+
+import java.nio.charset.StandardCharsets;
+import java.security.PrivateKey;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.ArrayList;
+import java.util.Date;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * T3-19（D3-8）：auth 域 M1 操作补进契约一致性保障，机制与
+ * patbond-pet 的 ContractConformanceTest 同构——对冻结契约 v1.4.0（快照
+ * {@code src/test/resources/contract/openapi-v1.4.0.yaml}，正典在 doc 仓
+ * {@code docs/api/openapi.yaml}）逐操作真实发请求，用 {@link ContractValidator}
+ * 严格校验响应结构，最后以全响应矩阵门禁兜底。
+ *
+ * <p>与 pet 侧的差别只在运行方式：register/login/refresh/logout 走真实 HTTP
+ * 打到 auth 服务（本测试的 Spring 上下文），me/trackEvents 打到同 JVM 内
+ * 启动的真实 user 服务（复用 AuthE2eIntegrationTest 的编排先例），
+ * 因此这些操作是跨服务的真实纵切，不是 MockMvc 短路。
+ *
+ * <p><b>T3.5-07</b>：v1.4.0 把 {@code PATCH /api/v1/me} 与 {@code GET} 的
+ * nickname/avatarUrl 纳入冻结面，故本类的操作面自 6 增至 7。注意
+ * {@code /api/v1/me} 的守卫与矩阵都在 **auth 模块**（实现在 patbond-user，
+ * 但契约测试在这里跨服务发请求），扩契约时容易漏。本类不配置对象存储，
+ * 故 {@code avatarUrl} 恒为 null——正是「存储未配置时资料读取整体降级」的
+ * nullable 实证；真实签名 URL 的全链路在 patbond-user 的
+ * MeAvatarSigningIntegrationTest（真实 MinIO）覆盖。
+ */
+@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+@SpringBootTest(
+        webEnvironment = SpringBootTest.WebEnvironment.RANDOM_PORT,
+        properties = SpringTestSupport.EXCLUDE_JDBC_AUTOCONFIG)
+class AuthContractConformanceTest {
+
+    private static final String INTERNAL_TOKEN = "contract-internal-token";
+
+    private static final OpenApiContract CONTRACT = OpenApiContract.load();
+    private static final ContractValidator VALIDATOR = new ContractValidator(CONTRACT);
+
+    /** 已被真实响应校验过的 (操作, 状态码) 单元格。 */
+    private static final Set<String> COVERED = ConcurrentHashMap.newKeySet();
+
+    /** auth 域 7 个操作（= 契约中 tags ∈ {auth, user, analytics}）。 */
+    private static final List<String> AUTH_OPERATIONS = List.of(
+            "POST /api/v1/auth/register",
+            "POST /api/v1/auth/login",
+            "POST /api/v1/auth/refresh",
+            "POST /api/v1/auth/logout",
+            "GET /api/v1/me",
+            "PATCH /api/v1/me",
+            "POST /api/v1/events");
+
+    private static final PostgreSQLContainer<?> POSTGRES = new PostgreSQLContainer<>("postgres:18");
+    private static ConfigurableApplicationContext userApp;
+    private static String userBaseUrl;
+
+    @Autowired
+    private TestRestTemplate restTemplate;
+
+    @DynamicPropertySource
+    static void bootUserServiceAndWireAuth(DynamicPropertyRegistry registry) {
+        POSTGRES.start();
+        userApp = new SpringApplicationBuilder(UserApplication.class).run(
+                "--server.port=0",
+                "--spring.application.name=patbond-user",
+                "--spring.datasource.url=" + POSTGRES.getJdbcUrl(),
+                "--spring.datasource.username=" + POSTGRES.getUsername(),
+                "--spring.datasource.password=" + POSTGRES.getPassword(),
+                "--patbond.internal-token=" + INTERNAL_TOKEN,
+                "--patbond.jwt.public-key=" + TestJwtKeys.publicPem(),
+                "--patbond.login-lock.max-failures=3");
+        userBaseUrl = "http://127.0.0.1:" + userApp.getEnvironment().getProperty("local.server.port");
+
+        registry.add("patbond.user-service.url", () -> userBaseUrl);
+        registry.add("patbond.internal-token", () -> INTERNAL_TOKEN);
+        registry.add("patbond.jwt.private-key", TestJwtKeys::privatePem);
+    }
+
+    @AfterAll
+    static void shutdown() {
+        if (userApp != null) {
+            userApp.close();
+        }
+        POSTGRES.stop();
+    }
+
+    // ---- 校验骨架 ------------------------------------------------------
+
+    /**
+     * 真实发请求，断言 HTTP 状态并将响应体对照冻结契约严格校验；通过后把
+     * (操作, 状态码) 记入覆盖表。url 为相对路径时打 auth 服务，绝对 URL
+     * （userBaseUrl 前缀）打 user 服务。
+     */
+    private String verified(HttpMethod method, String url, String pathTemplate,
+                            String body, String bearerToken, int expectedStatus) {
+        HttpHeaders headers = new HttpHeaders();
+        if (body != null) {
+            headers.setContentType(MediaType.APPLICATION_JSON);
+        }
+        if (bearerToken != null) {
+            headers.setBearerAuth(bearerToken);
+        }
+        ResponseEntity<byte[]> response = restTemplate.exchange(
+                url, method, new HttpEntity<>(body, headers), byte[].class);
+        String responseBody = response.getBody() == null
+                ? "" : new String(response.getBody(), StandardCharsets.UTF_8);
+        assertThat(response.getStatusCode().value())
+                .as("%s %s 的 HTTP 状态（响应体: %s）", method, pathTemplate, responseBody)
+                .isEqualTo(expectedStatus);
+        List<String> drift = VALIDATOR.validateResponse(
+                method.name(), pathTemplate, expectedStatus, responseBody);
+        assertThat(drift)
+                .as("%s %s %d 响应与冻结契约漂移", method, pathTemplate, expectedStatus)
+                .isEmpty();
+        COVERED.add(method.name() + " " + pathTemplate + " " + expectedStatus);
+        return responseBody;
+    }
+
+    /** 同上，并额外断言信封 code 等于契约错误码表约定的业务码。 */
+    private String verifiedError(HttpMethod method, String url, String pathTemplate,
+                                 String body, String bearerToken, int status, int bizCode) {
+        String responseBody = verified(method, url, pathTemplate, body, bearerToken, status);
+        assertThat((Integer) JsonPath.read(responseBody, "$.code"))
+                .as("%s %s %d 的业务错误码", method, pathTemplate, status)
+                .isEqualTo(bizCode);
+        return responseBody;
+    }
+
+    private String register(String username, String phone) {
+        return verified(HttpMethod.POST, "/api/v1/auth/register", "/api/v1/auth/register",
+                "{\"username\":\"%s\",\"phone\":\"%s\",\"password\":\"secret123\"}"
+                        .formatted(username, phone),
+                null, 200);
+    }
+
+    /** 用正确私钥签任意 subject 的 access token（404 场景等）。 */
+    private static String signToken(PrivateKey key, String subject, Duration ttl) {
+        Instant now = Instant.now();
+        return Jwts.builder()
+                .id(UUID.randomUUID().toString())
+                .subject(subject)
+                .issuer("patbond-auth")
+                .claim("sid", UUID.randomUUID().toString())
+                .issuedAt(Date.from(now))
+                .expiration(Date.from(now.plus(ttl)))
+                .signWith(key, Jwts.SIG.RS256)
+                .compact();
+    }
+
+    // ---- 成功路径 ------------------------------------------------------
+
+    @Test
+    @Order(1)
+    void registerRefreshLogoutSuccessShapes() {
+        String registered = register("contract_auth_alice", "+8613800000601");
+        String refreshToken = JsonPath.read(registered, "$.data.refreshToken");
+
+        // refresh 轮换出新令牌对
+        String rotated = verified(HttpMethod.POST, "/api/v1/auth/refresh", "/api/v1/auth/refresh",
+                "{\"refreshToken\":\"%s\"}".formatted(refreshToken), null, 200);
+        String rotatedAccess = JsonPath.read(rotated, "$.data.accessToken");
+        String rotatedRefresh = JsonPath.read(rotated, "$.data.refreshToken");
+
+        // logout 撤销当前会话
+        verified(HttpMethod.POST, "/api/v1/auth/logout", "/api/v1/auth/logout",
+                "{\"refreshToken\":\"%s\"}".formatted(rotatedRefresh), rotatedAccess, 200);
+    }
+
+    @Test
+    @Order(2)
+    void loginAndMeSuccessShapes() {
+        register("contract_auth_bob", "+8613800000602");
+        String loggedIn = verified(HttpMethod.POST, "/api/v1/auth/login", "/api/v1/auth/login",
+                "{\"username\":\"contract_auth_bob\",\"password\":\"secret123\"}", null, 200);
+        String accessToken = JsonPath.read(loggedIn, "$.data.accessToken");
+
+        String me = verified(HttpMethod.GET, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                null, accessToken, 200);
+        assertThat((String) JsonPath.read(me, "$.data.username")).isEqualTo("contract_auth_bob");
+    }
+
+    @Test
+    @Order(3)
+    void trackEventsSuccessShape() {
+        // 匿名合法批次：202 + 与请求等长的逐条结果
+        String body = verified(HttpMethod.POST, userBaseUrl + "/api/v1/events", "/api/v1/events",
+                """
+                {"events": [{
+                    "eventId": "%s",
+                    "eventName": "auth_register_started",
+                    "eventVersion": 1,
+                    "anonymousId": "%s",
+                    "sessionId": "%s",
+                    "clientTs": "2026-09-08T10:00:00Z",
+                    "appVersion": "1.0.0+1",
+                    "platform": "android",
+                    "osVersion": "android-14",
+                    "props": {"entryPoint": "onboarding"}
+                }]}
+                """.formatted(UUID.randomUUID(), UUID.randomUUID(), UUID.randomUUID()),
+                null, 202);
+        assertThat((String) JsonPath.read(body, "$.data.results[0].status")).isEqualTo("accepted");
+    }
+
+    // ---- 错误信封 ------------------------------------------------------
+
+    @Test
+    @Order(4)
+    void validationErrorsAnswer40000() {
+        verifiedError(HttpMethod.POST, "/api/v1/auth/register", "/api/v1/auth/register",
+                "{}", null, 400, 40000);
+        verifiedError(HttpMethod.POST, "/api/v1/auth/login", "/api/v1/auth/login",
+                "{}", null, 400, 40000);
+        verifiedError(HttpMethod.POST, "/api/v1/auth/refresh", "/api/v1/auth/refresh",
+                "{}", null, 400, 40000);
+
+        // logout 400：token 合法但 body 缺 refreshToken
+        String registered = register("contract_auth_carol", "+8613800000603");
+        String accessToken = JsonPath.read(registered, "$.data.accessToken");
+        verifiedError(HttpMethod.POST, "/api/v1/auth/logout", "/api/v1/auth/logout",
+                "{}", accessToken, 400, 40000);
+
+        // events 400：空批次整批拒绝
+        verifiedError(HttpMethod.POST, userBaseUrl + "/api/v1/events", "/api/v1/events",
+                "{\"events\":[]}", null, 400, 40000);
+    }
+
+    @Test
+    @Order(5)
+    void conflictAndCredentialErrorsMatchContract() {
+        register("contract_auth_dave", "+8613800000604");
+
+        // register 409：用户名占用 40900 / 手机号占用 40901（同一单元格的两种业务码）
+        verifiedError(HttpMethod.POST, "/api/v1/auth/register", "/api/v1/auth/register",
+                "{\"username\":\"contract_auth_dave\",\"phone\":\"+8613800000605\",\"password\":\"secret123\"}",
+                null, 409, 40900);
+        verifiedError(HttpMethod.POST, "/api/v1/auth/register", "/api/v1/auth/register",
+                "{\"username\":\"contract_auth_dave2\",\"phone\":\"+8613800000604\",\"password\":\"secret123\"}",
+                null, 409, 40901);
+
+        // login 401：密码错误 40100
+        verifiedError(HttpMethod.POST, "/api/v1/auth/login", "/api/v1/auth/login",
+                "{\"username\":\"contract_auth_dave\",\"password\":\"wrong-pass\"}",
+                null, 401, 40100);
+
+        // refresh 401：已轮换 token 重放 40102
+        String registered = register("contract_auth_erin", "+8613800000606");
+        String refreshToken = JsonPath.read(registered, "$.data.refreshToken");
+        verified(HttpMethod.POST, "/api/v1/auth/refresh", "/api/v1/auth/refresh",
+                "{\"refreshToken\":\"%s\"}".formatted(refreshToken), null, 200);
+        verifiedError(HttpMethod.POST, "/api/v1/auth/refresh", "/api/v1/auth/refresh",
+                "{\"refreshToken\":\"%s\"}".formatted(refreshToken), null, 401, 40102);
+
+        // logout 401：缺 access token
+        verifiedError(HttpMethod.POST, "/api/v1/auth/logout", "/api/v1/auth/logout",
+                "{\"refreshToken\":\"whatever\"}", null, 401, 40101);
+
+        // me 401：无 token；404：合法签名但用户不存在（40400）
+        verifiedError(HttpMethod.GET, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                null, null, 401, 40101);
+        String ghostToken = signToken(TestJwtKeys.KEY_PAIR.getPrivate(),
+                UUID.randomUUID().toString(), Duration.ofMinutes(15));
+        verifiedError(HttpMethod.GET, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                null, ghostToken, 404, 40400);
+
+        // events 401：携带了 Authorization 但 token 无效
+        verifiedError(HttpMethod.POST, userBaseUrl + "/api/v1/events", "/api/v1/events",
+                "{\"events\":[]}", "not-a-token", 401, 40101);
+    }
+
+    @Test
+    @Order(6)
+    void loginLockoutAnswers42300() {
+        register("contract_auth_locked", "+8613800000607");
+        for (int i = 0; i < 3; i++) {
+            verifiedError(HttpMethod.POST, "/api/v1/auth/login", "/api/v1/auth/login",
+                    "{\"username\":\"contract_auth_locked\",\"password\":\"wrong-pass\"}",
+                    null, 401, 40100);
+        }
+        // 窗口内失败达到阈值（测试将阈值降为 3）：即使密码正确也锁定
+        verifiedError(HttpMethod.POST, "/api/v1/auth/login", "/api/v1/auth/login",
+                "{\"username\":\"contract_auth_locked\",\"password\":\"secret123\"}",
+                null, 423, 42300);
+    }
+
+    // ---- PATCH /api/v1/me（v1.4.0 新增操作，T3.5-07）--------------------
+
+    /**
+     * `PATCH /api/v1/me` 的全响应矩阵（200/400/401/404/422）与三态语义的形态
+     * 实证，外加 GET 在 nickname 非空分支上再走一遍严格校验。
+     *
+     * <p>422/42203 需要一枚「本人所有、用途 user_avatar、状态 uploading」的
+     * asset：本上下文未配置对象存储（创建上传会 500），故按 MeProfileIntegrationTest
+     * 的先例直接写 media.assets 行——测试数据造法，不触碰实现。
+     */
+    @Test
+    @Order(7)
+    void meProfileWriteShapes() {
+        String registered = register("contract_auth_frank", "+8613800000608");
+        String accessToken = JsonPath.read(registered, "$.data.accessToken");
+        UUID userId = UUID.fromString(JsonPath.read(registered, "$.data.userId"));
+
+        // 200：三态「给值」——设昵称；avatarUrl 为 null（存储未配置时的降级实证）
+        String patched = verified(HttpMethod.PATCH, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                "{\"nickname\":\"契约昵称\"}", accessToken, 200);
+        assertThat((String) JsonPath.read(patched, "$.data.nickname")).isEqualTo("契约昵称");
+        assertThat((Object) JsonPath.read(patched, "$.data.avatarUrl")).isNull();
+
+        // GET 回读：nickname 非空分支同样过严格校验（PATCH 与 GET 同一 Me 形态）
+        String reread = verified(HttpMethod.GET, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                null, accessToken, 200);
+        assertThat((String) JsonPath.read(reread, "$.data.nickname")).isEqualTo("契约昵称");
+
+        // 200：三态「显式 null = 清空」
+        String cleared = verified(HttpMethod.PATCH, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                "{\"nickname\":null}", accessToken, 200);
+        assertThat((Object) JsonPath.read(cleared, "$.data.nickname")).isNull();
+
+        // 400/40000：空 patch（不静默 200）
+        verifiedError(HttpMethod.PATCH, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                "{}", accessToken, 400, 40000);
+
+        // 401/40101：无 token
+        verifiedError(HttpMethod.PATCH, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                "{\"nickname\":\"无票\"}", null, 401, 40101);
+
+        // 404：同一单元格的两种业务码——用户已注销 40400 / asset 不可引用 40405
+        String ghostToken = signToken(TestJwtKeys.KEY_PAIR.getPrivate(),
+                UUID.randomUUID().toString(), Duration.ofMinutes(15));
+        verifiedError(HttpMethod.PATCH, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                "{\"nickname\":\"幽灵\"}", ghostToken, 404, 40400);
+        verifiedError(HttpMethod.PATCH, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                "{\"avatarAssetId\":\"%s\"}".formatted(UUID.randomUUID()),
+                accessToken, 404, 40405);
+
+        // 422/42203：本人的 user_avatar asset 仍在 uploading
+        UUID uploading = insertUserAvatarAsset(userId, "uploading");
+        verifiedError(HttpMethod.PATCH, userBaseUrl + "/api/v1/me", "/api/v1/me",
+                "{\"avatarAssetId\":\"%s\"}".formatted(uploading), accessToken, 422, 42203);
+    }
+
+    /** 一枚本人所有的 user_avatar asset 行（模拟 T3-03 两步上传的中间产物）。 */
+    private UUID insertUserAvatarAsset(UUID ownerUserId, String status) {
+        UUID id = UUID.randomUUID();
+        userApp.getBean(JdbcClient.class).sql("""
+                        INSERT INTO media.assets
+                            (id, owner_user_id, kind, purpose, storage_type, bucket, object_key,
+                             mime_type, byte_size, status)
+                        VALUES (:id, :owner, 'image', 'user_avatar', 'object', 'patbond-media',
+                                :objectKey, 'image/jpeg', 2048, :status)
+                        """)
+                .param("id", id)
+                .param("owner", ownerUserId)
+                .param("objectKey", "user_avatar/2026/09/" + id)
+                .param("status", status)
+                .update();
+        return id;
+    }
+
+    // ---- 快照与覆盖门禁 -------------------------------------------------
+
+    /**
+     * 冻结快照守卫：与 pet 侧同一纪律——正典契约升版时必须同步复制新快照
+     * 并更新期望值，忘记同步在 CI 立即变红。
+     */
+    @Test
+    @Order(98)
+    void frozenSnapshotIsTheExpectedContractVersion() {
+        assertThat(CONTRACT.version()).isEqualTo("1.4.0");
+        assertThat(CONTRACT.paths()).hasSize(32);
+        assertThat(CONTRACT.operations()).hasSize(45);
+        assertThat(CONTRACT.schemas()).hasSize(75);
+        assertThat(CONTRACT.operationsTagged(Set.of("auth", "user", "analytics")))
+                .containsExactlyInAnyOrderElementsOf(AUTH_OPERATIONS);
+    }
+
+    /**
+     * 全矩阵覆盖门禁：auth 域 7 个操作声明的每个 (操作, 状态码) 都必须被
+     * 前面的测试真实触发并通过契约校验（24 个单元格，无豁免）。
+     */
+    @Test
+    @Order(99)
+    void everyDeclaredResponseCellIsExercised() {
+        List<String> missing = new ArrayList<>();
+        for (String op : AUTH_OPERATIONS) {
+            for (int status : CONTRACT.responseStatuses(op)) {
+                String cell = op + " " + status;
+                if (!COVERED.contains(cell)) {
+                    missing.add(cell);
+                }
+            }
+        }
+        assertThat(missing).as("契约声明但未被契约测试触发的响应单元格").isEmpty();
+    }
+}

patbond-auth/src/test/java/com/patbond/patbond/auth/contract/ContractValidator.java

@@ -0,0 +1,256 @@
+package com.patbond.patbond.auth.contract;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.time.OffsetDateTime;
+import java.time.format.DateTimeParseException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static com.patbond.patbond.auth.contract.OpenApiContract.cast;
+import static com.patbond.patbond.auth.contract.OpenApiContract.list;
+import static com.patbond.patbond.auth.contract.OpenApiContract.map;
+
+/**
+ * Validates an actual HTTP response against the frozen contract, strictly:
+ *
+ * <ul>
+ *   <li>the operation and the status must be declared;</li>
+ *   <li>required fields must be present; a null value needs {@code nullable};</li>
+ *   <li>fields the schema does not declare are rejected (this is what catches
+ *       a renamed or newly leaked field — plain OpenAPI semantics would allow
+ *       extra properties, but the frozen contract is "exactly these fields");</li>
+ *   <li>types, enum membership, uuid / date-time / date formats and
+ *       min/max(Length) bounds are checked.</li>
+ * </ul>
+ *
+ * Behavioural semantics (state machines, anti-enumeration, permission logic)
+ * stay with the existing integration tests — this class only pins structure.
+ */
+final class ContractValidator {
+
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    private final OpenApiContract contract;
+
+    ContractValidator(OpenApiContract contract) {
+        this.contract = contract;
+    }
+
+    /**
+     * @return drift findings, empty when the response conforms; each entry is
+     *         a human-readable "where: what" line
+     */
+    List<String> validateResponse(String method, String pathTemplate, int status, String body) {
+        List<String> errors = new ArrayList<>();
+        String opKey = method + " " + pathTemplate;
+        Map<String, Object> op = contract.operation(opKey);
+        if (op == null) {
+            errors.add("契约未声明该操作: " + opKey);
+            return errors;
+        }
+        Object respNode = map(op, "responses").get(String.valueOf(status));
+        if (respNode == null) {
+            errors.add("契约未为 " + opKey + " 声明状态码 " + status);
+            return errors;
+        }
+        Map<String, Object> content = map(contract.resolve(cast(respNode)), "content");
+        if (content == null) {
+            return errors; // response declared without a body
+        }
+        Map<String, Object> schema = map(map(content, "application/json"), "schema");
+        if (schema == null) {
+            errors.add(opKey + " " + status + ": 契约声明了 content 但无 application/json schema");
+            return errors;
+        }
+        JsonNode node;
+        try {
+            node = MAPPER.readTree(body);
+        } catch (JsonProcessingException e) {
+            errors.add(opKey + " " + status + ": 响应体不是合法 JSON: " + e.getOriginalMessage());
+            return errors;
+        }
+        validate(schema, node, "$", errors);
+        return errors;
+    }
+
+    private void validate(Map<String, Object> rawSchema, JsonNode node, String loc, List<String> errors) {
+        Map<String, Object> schema = effectiveSchema(rawSchema);
+        if (node == null || node.isMissingNode()) {
+            errors.add(loc + ": 字段缺失");
+            return;
+        }
+        if (node.isNull()) {
+            if (!Boolean.TRUE.equals(schema.get("nullable"))) {
+                errors.add(loc + ": 为 null，但契约未声明 nullable");
+            }
+            return;
+        }
+        List<Object> allowed = list(schema, "enum");
+        if (allowed != null && !enumMatches(allowed, node)) {
+            errors.add(loc + ": 值 " + node + " 不在契约枚举 " + allowed + " 内");
+        }
+        String type = (String) schema.get("type");
+        if (type == null) {
+            type = schema.containsKey("properties") ? "object" : null;
+        }
+        if (type == null) {
+            return;
+        }
+        switch (type) {
+            case "object" -> validateObject(schema, node, loc, errors);
+            case "array" -> validateArray(schema, node, loc, errors);
+            case "string" -> validateString(schema, node, loc, errors);
+            case "integer" -> {
+                if (!node.isIntegralNumber()) {
+                    errors.add(loc + ": 应为 integer，实际 " + node.getNodeType() + " " + node);
+                } else {
+                    checkRange(schema, node.decimalValue(), loc, errors);
+                }
+            }
+            case "number" -> {
+                if (!node.isNumber()) {
+                    errors.add(loc + ": 应为 number，实际 " + node.getNodeType() + " " + node);
+                } else {
+                    checkRange(schema, node.decimalValue(), loc, errors);
+                }
+            }
+            case "boolean" -> {
+                if (!node.isBoolean()) {
+                    errors.add(loc + ": 应为 boolean，实际 " + node.getNodeType() + " " + node);
+                }
+            }
+            default -> errors.add(loc + ": 契约测试不支持的 type " + type);
+        }
+    }
+
+    /**
+     * Resolves $refs and flattens the v1.3.0 {@code nullable + allOf: [$ref]}
+     * pattern into one plain schema (branch keys first, sibling keys — e.g.
+     * the outer {@code nullable} — win). The frozen contract only ever uses
+     * single-branch allOf, so a shallow merge is exact; overlapping
+     * {@code properties} across branches would need a deep merge and are not
+     * supported.
+     */
+    private Map<String, Object> effectiveSchema(Map<String, Object> rawSchema) {
+        Map<String, Object> schema = contract.resolve(rawSchema);
+        List<Object> allOf = list(schema, "allOf");
+        if (allOf == null) {
+            return schema;
+        }
+        Map<String, Object> merged = new LinkedHashMap<>();
+        for (Object branch : allOf) {
+            merged.putAll(effectiveSchema(cast(branch)));
+        }
+        schema.forEach((key, value) -> {
+            if (!"allOf".equals(key)) {
+                merged.put(key, value);
+            }
+        });
+        return merged;
+    }
+
+    private void validateObject(Map<String, Object> schema, JsonNode node, String loc, List<String> errors) {
+        if (!node.isObject()) {
+            errors.add(loc + ": 应为 object，实际 " + node.getNodeType());
+            return;
+        }
+        Map<String, Object> props = map(schema, "properties");
+        List<Object> required = list(schema, "required");
+        if (required != null) {
+            for (Object r : required) {
+                if (!node.has((String) r)) {
+                    errors.add(loc + "." + r + ": 契约必填字段缺失");
+                }
+            }
+        }
+        Object additional = schema.get("additionalProperties");
+        boolean open = Boolean.TRUE.equals(additional) || additional instanceof Map;
+        Iterator<Map.Entry<String, JsonNode>> fields = node.fields();
+        while (fields.hasNext()) {
+            Map.Entry<String, JsonNode> field = fields.next();
+            Map<String, Object> propSchema = props == null ? null : cast(props.get(field.getKey()));
+            if (propSchema != null) {
+                validate(propSchema, field.getValue(), loc + "." + field.getKey(), errors);
+            } else if (!open) {
+                errors.add(loc + "." + field.getKey() + ": 契约未声明的字段（结构漂移）");
+            }
+        }
+    }
+
+    private void validateArray(Map<String, Object> schema, JsonNode node, String loc, List<String> errors) {
+        if (!node.isArray()) {
+            errors.add(loc + ": 应为 array，实际 " + node.getNodeType());
+            return;
+        }
+        Map<String, Object> items = map(schema, "items");
+        if (items == null) {
+            return;
+        }
+        int i = 0;
+        for (JsonNode element : node) {
+            validate(items, element, loc + "[" + i++ + "]", errors);
+        }
+    }
+
+    private void validateString(Map<String, Object> schema, JsonNode node, String loc, List<String> errors) {
+        if (!node.isTextual()) {
+            errors.add(loc + ": 应为 string，实际 " + node.getNodeType() + " " + node);
+            return;
+        }
+        String value = node.asText();
+        String format = (String) schema.get("format");
+        if (format != null) {
+            try {
+                switch (format) {
+                    case "uuid" -> {
+                        if (value.length() != 36) {
+                            throw new IllegalArgumentException("非规范 UUID 长度");
+                        }
+                        java.util.UUID.fromString(value);
+                    }
+                    case "date-time" -> OffsetDateTime.parse(value);
+                    case "date" -> LocalDate.parse(value);
+                    default -> { /* password 等纯标注格式不校验 */ }
+                }
+            } catch (IllegalArgumentException | DateTimeParseException e) {
+                errors.add(loc + ": \"" + value + "\" 不符合 format=" + format);
+            }
+        }
+        if (schema.get("minLength") instanceof Number min && value.length() < min.intValue()) {
+            errors.add(loc + ": 长度 " + value.length() + " 小于契约 minLength " + min);
+        }
+        if (schema.get("maxLength") instanceof Number max && value.length() > max.intValue()) {
+            errors.add(loc + ": 长度 " + value.length() + " 大于契约 maxLength " + max);
+        }
+    }
+
+    private static void checkRange(Map<String, Object> schema, BigDecimal value, String loc, List<String> errors) {
+        if (schema.get("minimum") instanceof Number min
+                && value.compareTo(new BigDecimal(min.toString())) < 0) {
+            errors.add(loc + ": 值 " + value + " 小于契约 minimum " + min);
+        }
+        if (schema.get("maximum") instanceof Number max
+                && value.compareTo(new BigDecimal(max.toString())) > 0) {
+            errors.add(loc + ": 值 " + value + " 大于契约 maximum " + max);
+        }
+    }
+
+    private static boolean enumMatches(List<Object> allowed, JsonNode node) {
+        if (node.isTextual()) {
+            return allowed.contains(node.asText());
+        }
+        if (node.isIntegralNumber()) {
+            long v = node.longValue();
+            return allowed.stream().anyMatch(a -> a instanceof Number n && n.longValue() == v);
+        }
+        return false;
+    }
+}

patbond-auth/src/test/java/com/patbond/patbond/auth/contract/OpenApiContract.java

@@ -0,0 +1,151 @@
+package com.patbond.patbond.auth.contract;
+
+import org.yaml.snakeyaml.Yaml;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UncheckedIOException;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * The frozen v1.4.0 OpenAPI contract, loaded from the test-resource snapshot
+ * {@code /contract/openapi-v1.4.0.yaml}.
+ *
+ * <p><b>Sync discipline (T2-09, extended by T3-19)</b>: the canonical
+ * contract lives in the doc repo at {@code docs/api/openapi.yaml}; this
+ * snapshot is a byte-identical copy taken at freeze time, and this class is
+ * the module-local copy of the pet module's contract framework (same
+ * per-module duplication discipline as BearerAuthFilter). Whenever the
+ * canonical contract changes, copy it into every framework-carrying module
+ * (patbond-pet / patbond-auth / patbond-community / patbond-user) under the
+ * new version's file name and update each conformance test (expected version
+ * + snapshot counts). The guard test on {@code info.version} makes a forgotten
+ * sync fail loudly in CI instead of silently testing against a stale
+ * contract.
+ *
+ * <p>Only the subset of OpenAPI 3.0 this contract actually uses is supported:
+ * local {@code #/} refs, plain types, {@code nullable}, {@code enum},
+ * {@code required}, {@code properties}, {@code items}, and the v1.3.0
+ * single-branch {@code nullable + allOf: [$ref]} pattern (merged in
+ * {@link ContractValidator}) — no oneOf/anyOf.
+ */
+final class OpenApiContract {
+
+    static final String RESOURCE = "/contract/openapi-v1.4.0.yaml";
+
+    private static final Set<String> HTTP_METHODS =
+            Set.of("get", "put", "post", "delete", "options", "head", "patch", "trace");
+
+    private final Map<String, Object> root;
+
+    private OpenApiContract(Map<String, Object> root) {
+        this.root = root;
+    }
+
+    static OpenApiContract load() {
+        try (InputStream in = Objects.requireNonNull(
+                OpenApiContract.class.getResourceAsStream(RESOURCE),
+                "契约快照缺失: " + RESOURCE)) {
+            return new OpenApiContract(new Yaml().load(in));
+        } catch (IOException e) {
+            throw new UncheckedIOException(e);
+        }
+    }
+
+    String version() {
+        return (String) map(root, "info").get("version");
+    }
+
+    Map<String, Object> paths() {
+        return map(root, "paths");
+    }
+
+    Map<String, Object> schemas() {
+        return map(map(root, "components"), "schemas");
+    }
+
+    /** All declared operations as "METHOD pathTemplate" (insertion order). */
+    Set<String> operations() {
+        Set<String> ops = new LinkedHashSet<>();
+        paths().forEach((path, item) -> cast(item).forEach((method, op) -> {
+            if (HTTP_METHODS.contains(method)) {
+                ops.add(method.toUpperCase(Locale.ROOT) + " " + path);
+            }
+        }));
+        return ops;
+    }
+
+    /** Operations whose first tag is in {@code tags}, as "METHOD pathTemplate". */
+    Set<String> operationsTagged(Set<String> tags) {
+        Set<String> ops = new LinkedHashSet<>();
+        for (String key : operations()) {
+            List<Object> opTags = list(operation(key), "tags");
+            if (opTags != null && opTags.stream().anyMatch(tags::contains)) {
+                ops.add(key);
+            }
+        }
+        return ops;
+    }
+
+    /** Declared response statuses of an operation, as ints. */
+    Set<Integer> responseStatuses(String operationKey) {
+        Set<Integer> statuses = new LinkedHashSet<>();
+        map(operation(operationKey), "responses")
+                .keySet().forEach(s -> statuses.add(Integer.parseInt(s)));
+        return statuses;
+    }
+
+    /** The single 2xx status the operation declares. */
+    int successStatus(String operationKey) {
+        return responseStatuses(operationKey).stream()
+                .filter(s -> s >= 200 && s < 300)
+                .reduce((a, b) -> {
+                    throw new IllegalStateException("多个 2xx 响应: " + operationKey);
+                })
+                .orElseThrow(() -> new IllegalStateException("无 2xx 响应: " + operationKey));
+    }
+
+    /** Operation object for "METHOD pathTemplate", or null when undeclared. */
+    Map<String, Object> operation(String operationKey) {
+        String[] parts = operationKey.split(" ", 2);
+        Map<String, Object> pathItem = map(paths(), parts[1]);
+        return pathItem == null ? null : map(pathItem, parts[0].toLowerCase(Locale.ROOT));
+    }
+
+    /** Follows local $ref chains; non-ref maps come back unchanged. */
+    Map<String, Object> resolve(Map<String, Object> node) {
+        while (node != null && node.get("$ref") instanceof String ref) {
+            if (!ref.startsWith("#/")) {
+                throw new IllegalStateException("仅支持本地 $ref: " + ref);
+            }
+            Map<String, Object> cur = root;
+            for (String seg : ref.substring(2).split("/")) {
+                cur = map(cur, seg);
+                if (cur == null) {
+                    throw new IllegalStateException("$ref 指向不存在的节点: " + ref);
+                }
+            }
+            node = cur;
+        }
+        return node;
+    }
+
+    @SuppressWarnings("unchecked")
+    static Map<String, Object> cast(Object o) {
+        return (Map<String, Object>) o;
+    }
+
+    static Map<String, Object> map(Map<String, Object> m, String key) {
+        return m == null ? null : cast(m.get(key));
+    }
+
+    @SuppressWarnings("unchecked")
+    static List<Object> list(Map<String, Object> m, String key) {
+        return m == null ? null : (List<Object>) m.get(key);
+    }
+}

patbond-auth/src/test/java/com/patbond/patbond/auth/controller/AuthControllerTest.java

@@ -8,6 +8,7 @@ import com.patbond.patbond.auth.support.TestJwtKeys;
 import com.patbond.patbond.common.error.BusinessException;
 import com.patbond.patbond.common.error.ErrorCode;
 import com.patbond.patbond.common.response.ApiResponse;
+import com.patbond.patbond.common.session.CreateSessionRequest;
 import com.patbond.patbond.common.session.RevokeSessionRequest;
 import com.patbond.patbond.common.session.SessionTokens;
 import com.patbond.patbond.common.user.UserProfile;
@@ -109,7 +110,29 @@ class AuthControllerTest {
                 // Frozen contract: exactly these six fields, nothing else.
                 .andExpect(jsonPath("$.data.username").doesNotExist())
                 .andExpect(jsonPath("$.data.nickname").doesNotExist())
-                .andExpect(jsonPath("$.data.expiresAt").doesNotExist());
+                .andExpect(jsonPath("$.data.expiresAt").doesNotExist())
+                // Envelope is exactly {code, message, data}: the derived
+                // isSuccess() getter must not leak onto the wire.
+                .andExpect(jsonPath("$.success").doesNotExist());
+    }
+
+    @Test
+    void registerForwardsDeviceIdHeaderToTheSessionRecord() throws Exception {
+        when(userClient.createUser(any())).thenReturn(ApiResponse.success(
+                new UserProfile(USER_ID, "alice", null, "+8613800138000", OffsetDateTime.now())));
+        when(sessionClient.create(any())).thenReturn(ApiResponse.success(sessionTokens()));
+
+        mockMvc.perform(post("/api/v1/auth/register")
+                        .header("X-Device-Id", "pixel-8-of-alice")
+                        .contentType(APPLICATION_JSON)
+                        .content(REGISTER_BODY))
+                .andExpect(status().isOk());
+
+        ArgumentCaptor<CreateSessionRequest> captor =
+                ArgumentCaptor.forClass(CreateSessionRequest.class);
+        verify(sessionClient).create(captor.capture());
+        assertThat(captor.getValue().getDeviceId()).isEqualTo("pixel-8-of-alice");
+        assertThat(captor.getValue().getUserId()).isEqualTo(USER_ID);
     }
 
     @Test

patbond-common/pom.xml

@@ -25,6 +25,12 @@
             <groupId>jakarta.validation</groupId>
             <artifactId>jakarta.validation-api</artifactId>
         </dependency>
+        <!-- Annotations only (no databind): keeps the wire shape of the shared
+             envelope under the contract module's control. -->
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-test</artifactId>

patbond-common/src/main/java/com/patbond/patbond/common/error/ErrorCode.java

@@ -13,9 +13,26 @@ public enum ErrorCode {
     INVALID_CREDENTIALS(40100, 401, "用户名或密码错误"),
     TOKEN_INVALID(40101, 401, "token 无效或过期"),
     REFRESH_TOKEN_INVALID(40102, 401, "refresh token 已失效或被重用"),
+    PET_ACCESS_DENIED(40300, 403, "无权操作该宠物"),
+    POST_ACCESS_DENIED(40301, 403, "无权限执行该操作"),
     USER_NOT_FOUND(40400, 404, "用户不存在"),
+    PET_NOT_FOUND(40401, 404, "宠物不存在"),
+    RECORD_NOT_FOUND(40402, 404, "记录不存在"),
+    POST_NOT_FOUND(40403, 404, "帖子不存在"),
     USERNAME_EXISTS(40900, 409, "用户名已存在"),
     PHONE_EXISTS(40901, 409, "手机号已被使用"),
+    VERSION_CONFLICT(40902, 409, "数据已被修改，请刷新后重试"),
+    MICROCHIP_EXISTS(40903, 409, "芯片号已被其他宠物登记"),
+    VACCINATION_DOSE_EXISTS(40904, 409, "该疫苗系列剂次已登记"),
+    IDEMPOTENCY_PAYLOAD_MISMATCH(40905, 409, "幂等键已用于不同请求"),
+    MEDIA_NOT_FOUND(40405, 404, "媒体资源不存在"),
+    COMMENT_NOT_FOUND(40404, 404, "评论不存在"),
+    TARGET_USER_NOT_FOUND(40406, 404, "用户不存在"),
+    VACCINATION_RULE_VIOLATION(42201, 422, "疫苗状态或日期约束不满足"),
+    REMINDER_RULE_VIOLATION(42202, 422, "提醒状态或 completedAt 约束不满足"),
+    MEDIA_NOT_READY(42203, 422, "媒体尚未就绪"),
+    FOLLOW_RULE_VIOLATION(42204, 422, "不能关注自己"),
+    MEDIA_UPLOAD_STATE_INVALID(42205, 422, "上传状态不允许确认"),
     LOGIN_LOCKED(42300, 423, "登录失败次数过多，账号已临时锁定"),
     INTERNAL_ERROR(50000, 500, "服务器内部错误"),
     DOWNSTREAM_UNAVAILABLE(50300, 503, "依赖服务暂不可用");

patbond-common/src/main/java/com/patbond/patbond/common/response/ApiResponse.java

@@ -1,5 +1,7 @@
 package com.patbond.patbond.common.response;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
 public class ApiResponse<T> {
 
     private Integer code;
@@ -23,6 +25,11 @@ public class ApiResponse<T> {
         return new ApiResponse<>(code, message, null);
     }
 
+    /**
+     * Derived convenience only — not part of the frozen wire contract
+     * {@code {code, message, data}}, hence never serialized.
+     */
+    @JsonIgnore
     public boolean isSuccess() {
         return Integer.valueOf(0).equals(code);
     }

patbond-common/src/main/java/com/patbond/patbond/common/session/CreateSessionRequest.java

@@ -15,6 +15,9 @@ public class CreateSessionRequest {
     @NotNull(message = "userId 不能为空")
     private UUID userId;
 
+    @Size(max = 128, message = "deviceId 长度不能超过128位")
+    private String deviceId;
+
     @Size(max = 512, message = "userAgent 长度不能超过512位")
     private String userAgent;
 
@@ -24,8 +27,9 @@ public class CreateSessionRequest {
     public CreateSessionRequest() {
     }
 
-    public CreateSessionRequest(UUID userId, String userAgent, String ipAddress) {
+    public CreateSessionRequest(UUID userId, String deviceId, String userAgent, String ipAddress) {
         this.userId = userId;
+        this.deviceId = deviceId;
         this.userAgent = userAgent;
         this.ipAddress = ipAddress;
     }
@@ -38,6 +42,14 @@ public class CreateSessionRequest {
         this.userId = userId;
     }
 
+    public String getDeviceId() {
+        return deviceId;
+    }
+
+    public void setDeviceId(String deviceId) {
+        this.deviceId = deviceId;
+    }
+
     public String getUserAgent() {
         return userAgent;
     }

patbond-community/Dockerfile

@@ -0,0 +1,9 @@
+# Runtime image only — build the jar first: ./mvnw -pl patbond-community -am package
+# Stateless by design (ADR-007): no local state, config via env / mounted files.
+FROM eclipse-temurin:17-jre
+RUN useradd --system --uid 10001 patbond
+USER patbond
+WORKDIR /app
+COPY target/patbond-community-1.0.0-SNAPSHOT-exec.jar app.jar
+EXPOSE 8084
+ENTRYPOINT ["java", "-jar", "/app/app.jar"]

patbond-community/pom.xml

@@ -0,0 +1,155 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<project xmlns="http://maven.apache.org/POM/4.0.0"
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>com.patbond.patbond</groupId>
+        <artifactId>patbond-api</artifactId>
+        <version>1.0.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>patbond-community</artifactId>
+    <packaging>jar</packaging>
+
+    <name>patbond-community</name>
+    <description>Community feed, posts and interactions service for Patbond (ADR-017)</description>
+
+    <!-- M3 first-wave skeleton: RS256 bearer auth on /api/v1/** (same JWT
+         verification stack as patbond-user/pet), community schema access via
+         JDBC. Flyway remains absent — the migration chain is owned by
+         patbond-user. -->
+    <dependencies>
+        <dependency>
+            <groupId>com.patbond.patbond</groupId>
+            <artifactId>patbond-common</artifactId>
+            <version>${project.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-web</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-validation</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-jdbc</artifactId>
+        </dependency>
+        <!-- Author public profiles come from patbond-user's /internal batch
+             API (D3-9 方案 B), static direct URL per ADR-002. feign-hc5 for
+             the same reason as patbond-auth: the JDK default client loses
+             error bodies on some replies. -->
+        <dependency>
+            <groupId>org.springframework.cloud</groupId>
+            <artifactId>spring-cloud-starter-openfeign</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>io.github.openfeign</groupId>
+            <artifactId>feign-hc5</artifactId>
+        </dependency>
+        <dependency>
+            <groupId>org.postgresql</groupId>
+            <artifactId>postgresql</artifactId>
+            <scope>runtime</scope>
+        </dependency>
+        <!-- Read-side media URL signing only (presigned GET is a local SigV4
+             computation): this service never talks to the object store, the
+             media write flow stays in patbond-user (ADR-016/017). Version
+             managed by the root pom's awssdk bom. -->
+        <dependency>
+            <groupId>software.amazon.awssdk</groupId>
+            <artifactId>s3</artifactId>
+        </dependency>
+        <!-- Access token verification (RS256, public key only): jjwt is not in
+             the Boot BOM, version pinned in step with patbond-user/auth/pet. -->
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-api</artifactId>
+            <version>0.12.6</version>
+        </dependency>
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-impl</artifactId>
+            <version>0.12.6</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>io.jsonwebtoken</groupId>
+            <artifactId>jjwt-jackson</artifactId>
+            <version>0.12.6</version>
+            <scope>runtime</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-starter-test</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <!-- Tests need the community schema. The migration chain (V1..V5) is
+             owned by patbond-user (single flyway_schema_history); pulling its
+             plain jar plus Flyway into the TEST classpath lets Boot's Flyway
+             auto-config apply the same chain to the disposable container.
+             Production wiring is unchanged: this module still ships without
+             Flyway and the chain runs in patbond-user's startup path (same
+             mechanism as patbond-pet). -->
+        <dependency>
+            <groupId>com.patbond.patbond</groupId>
+            <artifactId>patbond-user</artifactId>
+            <version>${project.version}</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-core</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.flywaydb</groupId>
+            <artifactId>flyway-database-postgresql</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.springframework.boot</groupId>
+            <artifactId>spring-boot-testcontainers</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>postgresql</artifactId>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.testcontainers</groupId>
+            <artifactId>junit-jupiter</artifactId>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.springframework.boot</groupId>
+                <artifactId>spring-boot-maven-plugin</artifactId>
+                <!-- No spring-boot-starter-parent in this build, so the
+                     executable-jar repackaging must be bound explicitly. -->
+                <executions>
+                    <execution>
+                        <goals>
+                            <goal>repackage</goal>
+                        </goals>
+                        <configuration>
+                            <!-- Keep the plain jar as the main artifact so other
+                                 modules can depend on this one; the runnable fat
+                                 jar gets the -exec classifier and is what the
+                                 Dockerfile ships (same pattern as user/auth/pet). -->
+                            <classifier>exec</classifier>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+</project>

patbond-community/src/main/java/com/patbond/patbond/community/CommunityApplication.java

@@ -0,0 +1,24 @@
+package com.patbond.patbond.community;
+
+import com.patbond.patbond.community.config.CommunityFeignConfig;
+import org.springframework.boot.SpringApplication;
+import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.cloud.openfeign.EnableFeignClients;
+
+/**
+ * Community feed, posts and interactions service (M3, ADR-017: the community
+ * domain lives in its own Maven module on :8084). Configuration wiring,
+ * datasource, RS256 bearer auth on /api/v1/**, the post lifecycle (T3-04)
+ * and the public feed (T3-05). The module only reads and writes the
+ * community schema (plus the ADR-017 read-only media.assets exception);
+ * author public profiles come from patbond-user's /internal batch API over
+ * Feign (D3-9 方案 B).
+ */
+@SpringBootApplication
+@EnableFeignClients(defaultConfiguration = CommunityFeignConfig.class)
+public class CommunityApplication {
+
+    public static void main(String[] args) {
+        SpringApplication.run(CommunityApplication.class, args);
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/access/PetVisibilityGateway.java

@@ -0,0 +1,44 @@
+package com.patbond.patbond.community.access;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Service;
+
+import java.util.UUID;
+
+/**
+ * Cross-schema visibility probe for posts.pet_id references. Semantics
+ * follow patbond-pet's PetAccessService anti-enumeration rule: a pet the
+ * caller has no pet_owners row for is indistinguishable from a nonexistent
+ * one — both answer 404/40401. Any role (owner/caregiver/viewer) may
+ * reference a visible pet from a post; referencing needs no write power
+ * over the pet itself.
+ */
+@Service
+public class PetVisibilityGateway {
+
+    private final JdbcClient jdbcClient;
+
+    public PetVisibilityGateway(JdbcClient jdbcClient) {
+        this.jdbcClient = jdbcClient;
+    }
+
+    /** @throws BusinessException 40401 when the pet is invisible to the caller */
+    public void requireVisible(UUID userId, UUID petId) {
+        boolean visible = jdbcClient.sql("""
+                        SELECT 1
+                        FROM pet_health.pets p
+                        JOIN pet_health.pet_owners po ON po.pet_id = p.id AND po.user_id = :userId
+                        WHERE p.id = :petId AND p.status <> 'deleted'
+                        """)
+                .param("userId", userId)
+                .param("petId", petId)
+                .query(Integer.class)
+                .optional()
+                .isPresent();
+        if (!visible) {
+            throw new BusinessException(ErrorCode.PET_NOT_FOUND);
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/access/UserExistenceGateway.java

@@ -0,0 +1,34 @@
+package com.patbond.patbond.community.access;
+
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Component;
+
+import java.util.UUID;
+
+/**
+ * Existence probe into identity.users for write gates that reference a
+ * user (follow target, comment @-reply target). Same-database read-only
+ * access under the ADR-017 exception — the user_follows/comments foreign
+ * keys already bind these schemas together, and a WRITE gate cannot ride
+ * the Feign profile path, whose degradation deliberately cannot tell
+ * "absent" from "unreachable". A soft-deleted (注销) user counts as absent.
+ */
+@Component
+public class UserExistenceGateway {
+
+    private final JdbcClient jdbcClient;
+
+    public UserExistenceGateway(JdbcClient jdbcClient) {
+        this.jdbcClient = jdbcClient;
+    }
+
+    public boolean existsActive(UUID userId) {
+        return jdbcClient.sql("""
+                        SELECT EXISTS (SELECT 1 FROM identity.users
+                                       WHERE id = :id AND deleted_at IS NULL)
+                        """)
+                .param("id", userId)
+                .query(Boolean.class)
+                .single();
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/author/AuthorProfileClient.java

@@ -0,0 +1,24 @@
+package com.patbond.patbond.community.author;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import org.springframework.cloud.openfeign.FeignClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import java.util.List;
+
+/**
+ * Batch public-profile API of patbond-user, the identity schema owner
+ * (D3-9 方案 B; static direct URL per ADR-002). The X-Internal-Token header
+ * is attached by the interceptor in CommunityFeignConfig. Unknown or
+ * deleted ids are silently absent from the reply. {@code primary = false}
+ * only matters to tests (lets a stub take precedence); in production this
+ * is the sole candidate.
+ */
+@FeignClient(name = "patbond-user-profiles", url = "${patbond.user-service.url}", primary = false)
+public interface AuthorProfileClient {
+
+    /** @param ids comma-separated user ids, at most 50 per call */
+    @GetMapping("/internal/users/profiles")
+    ApiResponse<List<AuthorProfileDto>> profiles(@RequestParam("ids") String ids);
+}

patbond-community/src/main/java/com/patbond/patbond/community/author/AuthorProfileDto.java

@@ -0,0 +1,14 @@
+package com.patbond.patbond.community.author;
+
+import java.util.UUID;
+
+/**
+ * Wire shape of one profile in patbond-user's /internal/users/profiles
+ * reply (D3-9 方案 B): display name (nickname→username fallback already
+ * applied by the owning service) plus the avatar asset pointer. The avatar
+ * arrives as an id, not a URL — this service resolves it against
+ * media.assets (ADR-017 read-only exception) and signs a fresh presigned
+ * GET per response, so nothing cached here ever holds an expiring URL.
+ */
+public record AuthorProfileDto(UUID userId, String nickname, UUID avatarAssetId) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/author/AuthorProfileGateway.java

@@ -0,0 +1,145 @@
+package com.patbond.patbond.community.author;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import com.patbond.patbond.community.dto.AuthorSummaryResponse;
+import com.patbond.patbond.community.media.MediaAssetGateway;
+import com.patbond.patbond.community.media.MediaAssetRef;
+import com.patbond.patbond.community.media.MediaUrlSigner;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.stereotype.Component;
+
+import java.util.ArrayList;
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+import java.util.stream.Collectors;
+
+/**
+ * Author public-profile lookup (D3-9 方案 B): a batch Feign call to
+ * patbond-user's /internal/users/profiles behind a short-TTL in-process
+ * cache, plus local avatar resolution.
+ *
+ * <ul>
+ *   <li><b>Batch, never loop</b> — one call per ≤50 distinct cache-missed
+ *       authors (a feed page has ≤20 cards, so normally exactly one call,
+ *       and none on a warm cache).</li>
+ *   <li><b>Avatar</b> — travels as an asset id; resolved to bucket/key via
+ *       the ADR-017 read-only media.assets exception (ready assets only)
+ *       and signed fresh per response, so the cache stores no expiring
+ *       URL.</li>
+ *   <li><b>Degradation</b> — ANY lookup failure (user service down, slow,
+ *       or answering an error) logs one warning and leaves the ids
+ *       unresolved; callers render the id-only summary. Failures are never
+ *       cached, so the next request retries; the feed never 5xxes over a
+ *       profile lookup.</li>
+ * </ul>
+ */
+@Component
+public class AuthorProfileGateway {
+
+    private static final int MAX_BATCH = 50;
+    /** Expired entries are pruned opportunistically past this size. */
+    private static final int PRUNE_THRESHOLD = 10_000;
+
+    private static final Logger log = LoggerFactory.getLogger(AuthorProfileGateway.class);
+
+    private final AuthorProfileClient client;
+    private final MediaAssetGateway mediaAssetGateway;
+    private final MediaUrlSigner mediaUrlSigner;
+    private final AuthorProfileProperties properties;
+    private final ConcurrentHashMap<UUID, CacheEntry> cache = new ConcurrentHashMap<>();
+
+    public AuthorProfileGateway(AuthorProfileClient client, MediaAssetGateway mediaAssetGateway,
+                                MediaUrlSigner mediaUrlSigner, AuthorProfileProperties properties) {
+        this.client = client;
+        this.mediaAssetGateway = mediaAssetGateway;
+        this.mediaUrlSigner = mediaUrlSigner;
+        this.properties = properties;
+    }
+
+    /**
+     * Summaries for the given authors, avatar URLs signed fresh. Ids that
+     * could not be resolved (lookup degraded, or the user no longer exists)
+     * are absent — callers fall back to
+     * {@link AuthorSummaryResponse#idOnly}.
+     */
+    public Map<UUID, AuthorSummaryResponse> summarize(Collection<UUID> userIds) {
+        if (userIds.isEmpty()) {
+            return Map.of();
+        }
+        long now = System.nanoTime();
+        Map<UUID, AuthorRef> resolved = new HashMap<>();
+        List<UUID> misses = new ArrayList<>();
+        for (UUID id : new LinkedHashSet<>(userIds)) {
+            CacheEntry entry = cache.get(id);
+            if (entry != null && entry.expiresAtNanos() - now > 0) {
+                resolved.put(id, entry.ref());
+            } else {
+                misses.add(id);
+            }
+        }
+        if (!misses.isEmpty()) {
+            fetchInto(resolved, misses, now);
+        }
+        Map<UUID, AuthorSummaryResponse> summaries = new HashMap<>();
+        resolved.forEach((id, ref) -> summaries.put(id, new AuthorSummaryResponse(
+                id, ref.nickname(), mediaUrlSigner.signGet(ref.avatarBucket(), ref.avatarObjectKey()))));
+        return summaries;
+    }
+
+    private void fetchInto(Map<UUID, AuthorRef> resolved, List<UUID> misses, long now) {
+        List<AuthorProfileDto> profiles = new ArrayList<>();
+        try {
+            for (int i = 0; i < misses.size(); i += MAX_BATCH) {
+                List<UUID> chunk = misses.subList(i, Math.min(i + MAX_BATCH, misses.size()));
+                ApiResponse<List<AuthorProfileDto>> reply = client.profiles(
+                        chunk.stream().map(UUID::toString).collect(Collectors.joining(",")));
+                if (reply != null && reply.getData() != null) {
+                    profiles.addAll(reply.getData());
+                }
+            }
+        } catch (RuntimeException e) {
+            // Chunks fetched before the failure still count below.
+            log.warn("作者公开资料获取失败，本次响应对未解析作者降级为 authorId 保底: {}",
+                    e.toString());
+        }
+        if (profiles.isEmpty()) {
+            return;
+        }
+        Set<UUID> assetIds = profiles.stream()
+                .map(AuthorProfileDto::avatarAssetId)
+                .filter(Objects::nonNull)
+                .collect(Collectors.toSet());
+        Map<UUID, MediaAssetRef> assets = assetIds.isEmpty()
+                ? Map.of()
+                : mediaAssetGateway.findByIds(assetIds);
+        long expiresAt = now + properties.getCacheTtl().toNanos();
+        for (AuthorProfileDto profile : profiles) {
+            MediaAssetRef asset = profile.avatarAssetId() == null
+                    ? null
+                    : assets.get(profile.avatarAssetId());
+            boolean ready = asset != null && "ready".equals(asset.status());
+            AuthorRef ref = new AuthorRef(profile.nickname(),
+                    ready ? asset.bucket() : null,
+                    ready ? asset.objectKey() : null);
+            cache.put(profile.userId(), new CacheEntry(ref, expiresAt));
+            resolved.put(profile.userId(), ref);
+        }
+        if (cache.size() > PRUNE_THRESHOLD) {
+            cache.values().removeIf(entry -> entry.expiresAtNanos() - now <= 0);
+        }
+    }
+
+    private record AuthorRef(String nickname, String avatarBucket, String avatarObjectKey) {
+    }
+
+    private record CacheEntry(AuthorRef ref, long expiresAtNanos) {
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/author/AuthorProfileProperties.java

@@ -0,0 +1,26 @@
+package com.patbond.patbond.community.author;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import java.time.Duration;
+
+/**
+ * Knobs of the author-profile lookup (D3-9 方案 B): a short in-process TTL
+ * cache in front of patbond-user's /internal batch API. 60 s is the frozen
+ * default — long enough to absorb feed scrolling and refresh bursts,
+ * short enough that a nickname/avatar change propagates within a minute.
+ */
+@ConfigurationProperties(prefix = "patbond.author-profile")
+public class AuthorProfileProperties {
+
+    /** How long one resolved profile stays in the in-process cache. */
+    private Duration cacheTtl = Duration.ofSeconds(60);
+
+    public Duration getCacheTtl() {
+        return cacheTtl;
+    }
+
+    public void setCacheTtl(Duration value) {
+        this.cacheTtl = value;
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/config/CommunityFeignConfig.java

@@ -0,0 +1,35 @@
+package com.patbond.patbond.community.config;
+
+import feign.Request;
+import feign.RequestInterceptor;
+import org.springframework.context.annotation.Bean;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Feign child-context beans, registered via
+ * {@code @EnableFeignClients(defaultConfiguration = …)} — deliberately not
+ * a @Configuration, same reasoning as patbond-auth's FeignInternalConfig
+ * (a component-scanned bean would land in the parent context and be
+ * shadowed by the child's defaults).
+ *
+ * <p>No ErrorDecoder on purpose: the only Feign consumer here is the author
+ * profile lookup, whose gateway degrades on ANY failure instead of
+ * propagating it — a downstream business error is as much "no profile" as a
+ * connection refusal. Timeouts are tight because this call sits on the feed
+ * read path: a hung patbond-user must cost one bounded stall, not an
+ * unbounded one (connection refused already fails fast on its own).</p>
+ */
+public class CommunityFeignConfig {
+
+    /** Presents the shared service secret on every call to patbond-user. */
+    @Bean
+    public RequestInterceptor internalTokenInterceptor(CommunitySecurityProperties properties) {
+        return template -> template.header("X-Internal-Token", properties.getInternalToken());
+    }
+
+    @Bean
+    public Request.Options feignOptions() {
+        return new Request.Options(1, TimeUnit.SECONDS, 2, TimeUnit.SECONDS, true);
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/config/CommunitySecurityProperties.java

@@ -0,0 +1,53 @@
+package com.patbond.patbond.community.config;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+/**
+ * Security knobs of the community service: the RS256 public key for
+ * verifying access tokens issued by patbond-auth (same contract as
+ * patbond-user/pet's {@code patbond.jwt.public-key}), and the shared
+ * service secret presented on outbound /internal/** calls to patbond-user
+ * (D3-9 方案 B author-profile lookups — this service still exposes no
+ * /internal routes of its own).
+ */
+@ConfigurationProperties(prefix = "patbond")
+public class CommunitySecurityProperties {
+
+    /**
+     * Shared secret sent as X-Internal-Token on calls to patbond-user's
+     * /internal/** API; must equal the value patbond-user expects.
+     */
+    private String internalToken;
+
+    private final Jwt jwt = new Jwt();
+
+    public String getInternalToken() {
+        return internalToken;
+    }
+
+    public void setInternalToken(String value) {
+        this.internalToken = value;
+    }
+
+    public Jwt getJwt() {
+        return jwt;
+    }
+
+    public static class Jwt {
+
+        /**
+         * RS256 public key for verifying access tokens signed by
+         * patbond-auth: either inline PEM (starts with -----BEGIN) or a
+         * filesystem path. The private key never reaches this service.
+         */
+        private String publicKey;
+
+        public String getPublicKey() {
+            return publicKey;
+        }
+
+        public void setPublicKey(String publicKey) {
+            this.publicKey = publicKey;
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/config/JacksonConfig.java

@@ -0,0 +1,21 @@
+package com.patbond.patbond.community.config;
+
+import com.fasterxml.jackson.databind.DeserializationFeature;
+import org.springframework.boot.autoconfigure.jackson.Jackson2ObjectMapperBuilderCustomizer;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Integer fields must reject decimal input (development-plan 4.3) — Jackson's
+ * default is to silently truncate 45.5 to 45 in an integer field, which
+ * would corrupt values instead of rejecting them. Same setting as the other
+ * services so all envelopes behave identically.
+ */
+@Configuration
+public class JacksonConfig {
+
+    @Bean
+    public Jackson2ObjectMapperBuilderCustomizer rejectFloatAsInt() {
+        return builder -> builder.featuresToDisable(DeserializationFeature.ACCEPT_FLOAT_AS_INT);
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/config/MediaConfig.java

@@ -0,0 +1,22 @@
+package com.patbond.patbond.community.config;
+
+import com.patbond.patbond.community.media.CommunityMediaProperties;
+import com.patbond.patbond.community.media.MediaUrlSigner;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Read-side media wiring: a presigned-GET signer over the same MinIO
+ * configuration patbond-user uses (ADR-016). Bean destruction closes the
+ * underlying presigner.
+ */
+@Configuration
+@EnableConfigurationProperties(CommunityMediaProperties.class)
+public class MediaConfig {
+
+    @Bean(destroyMethod = "close")
+    public MediaUrlSigner mediaUrlSigner(CommunityMediaProperties properties) {
+        return new MediaUrlSigner(properties);
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/config/SecurityConfig.java

@@ -0,0 +1,36 @@
+package com.patbond.patbond.community.config;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.patbond.patbond.community.author.AuthorProfileProperties;
+import com.patbond.patbond.community.security.BearerAuthFilter;
+import com.patbond.patbond.community.security.JwtVerifier;
+import org.springframework.boot.context.properties.EnableConfigurationProperties;
+import org.springframework.boot.web.servlet.FilterRegistrationBean;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Configuration;
+
+/**
+ * Wires bearer authentication for /api/v1/** without pulling in
+ * spring-security — the same single-filter pattern patbond-user and
+ * patbond-pet use. The /health probe stays outside /api/v1 and therefore
+ * unauthenticated.
+ */
+@Configuration
+@EnableConfigurationProperties({CommunitySecurityProperties.class, AuthorProfileProperties.class})
+public class SecurityConfig {
+
+    @Bean
+    public JwtVerifier jwtVerifier(CommunitySecurityProperties properties) {
+        return new JwtVerifier(properties.getJwt().getPublicKey());
+    }
+
+    @Bean
+    public FilterRegistrationBean<BearerAuthFilter> bearerAuthFilter(
+            JwtVerifier jwtVerifier, ObjectMapper objectMapper) {
+        FilterRegistrationBean<BearerAuthFilter> registration = new FilterRegistrationBean<>(
+                new BearerAuthFilter(jwtVerifier, objectMapper));
+        registration.addUrlPatterns("/api/v1/*");
+        registration.setOrder(20);
+        return registration;
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/controller/CommentController.java

@@ -0,0 +1,71 @@
+package com.patbond.patbond.community.controller;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import com.patbond.patbond.community.dto.CommentResponse;
+import com.patbond.patbond.community.dto.CreateCommentRequest;
+import com.patbond.patbond.community.dto.CursorPage;
+import com.patbond.patbond.community.security.BearerAuthFilter;
+import com.patbond.patbond.community.service.CommentService;
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestAttribute;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.UUID;
+
+/**
+ * Flat comment endpoints (T3-07). Delete rides the top-level short path
+ * (commentId is globally unique — the pets-domain precedent); create
+ * carries a MANDATORY Idempotency-Key (ADR-019). All permission and error
+ * semantics live in CommentService.
+ */
+@RestController
+@Validated
+public class CommentController {
+
+    private final CommentService commentService;
+
+    public CommentController(CommentService commentService) {
+        this.commentService = commentService;
+    }
+
+    @GetMapping("/api/v1/posts/{postId}/comments")
+    public ApiResponse<CursorPage<CommentResponse>> list(
+            @PathVariable UUID postId,
+            @RequestParam(defaultValue = "20")
+            @Min(value = 1, message = "limit 最小为 1")
+            @Max(value = 100, message = "limit 最大为 100")
+            int limit,
+            @RequestParam(required = false) String cursor) {
+        return ApiResponse.success(commentService.list(postId, limit, cursor));
+    }
+
+    @PostMapping("/api/v1/posts/{postId}/comments")
+    @ResponseStatus(HttpStatus.CREATED)
+    public ApiResponse<CommentResponse> create(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID postId,
+            @RequestHeader("Idempotency-Key") String idempotencyKey,
+            @Valid @RequestBody CreateCommentRequest request) {
+        return ApiResponse.success(commentService.create(userId, postId, idempotencyKey, request));
+    }
+
+    @DeleteMapping("/api/v1/comments/{commentId}")
+    public ApiResponse<Void> delete(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID commentId) {
+        commentService.delete(userId, commentId);
+        return ApiResponse.success(null);
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/controller/FeedController.java

@@ -0,0 +1,43 @@
+package com.patbond.patbond.community.controller;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import com.patbond.patbond.community.dto.CursorPage;
+import com.patbond.patbond.community.dto.FeedCardResponse;
+import com.patbond.patbond.community.security.BearerAuthFilter;
+import com.patbond.patbond.community.service.FeedService;
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RequestAttribute;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.UUID;
+
+/**
+ * Public feed endpoint (T3-05). Authenticated like every /api/v1 route —
+ * the viewer identity feeds likedByMe/bookmarkedByMe; the feed content
+ * itself is the same for everyone (published + public only).
+ */
+@RestController
+@Validated
+public class FeedController {
+
+    private final FeedService feedService;
+
+    public FeedController(FeedService feedService) {
+        this.feedService = feedService;
+    }
+
+    @GetMapping("/api/v1/feed")
+    public ApiResponse<CursorPage<FeedCardResponse>> feed(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @RequestParam(defaultValue = "20")
+            @Min(value = 1, message = "limit 最小为 1")
+            @Max(value = 100, message = "limit 最大为 100")
+            int limit,
+            @RequestParam(required = false) String cursor) {
+        return ApiResponse.success(feedService.list(userId, limit, cursor));
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/controller/FollowController.java

@@ -0,0 +1,51 @@
+package com.patbond.patbond.community.controller;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import com.patbond.patbond.community.dto.FollowStateResponse;
+import com.patbond.patbond.community.dto.FollowStatsResponse;
+import com.patbond.patbond.community.security.BearerAuthFilter;
+import com.patbond.patbond.community.service.FollowService;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestAttribute;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.UUID;
+
+/**
+ * The ADR-018 minimal follow surface (T3-07): idempotent follow/unfollow
+ * plus the numbers endpoint. Follower/following LISTS are deliberately not
+ * in M3.
+ */
+@RestController
+public class FollowController {
+
+    private final FollowService followService;
+
+    public FollowController(FollowService followService) {
+        this.followService = followService;
+    }
+
+    @PutMapping("/api/v1/users/{userId}/follow")
+    public ApiResponse<FollowStateResponse> follow(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID callerId,
+            @PathVariable UUID userId) {
+        return ApiResponse.success(followService.follow(callerId, userId));
+    }
+
+    @DeleteMapping("/api/v1/users/{userId}/follow")
+    public ApiResponse<FollowStateResponse> unfollow(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID callerId,
+            @PathVariable UUID userId) {
+        return ApiResponse.success(followService.unfollow(callerId, userId));
+    }
+
+    @GetMapping("/api/v1/users/{userId}/follow-stats")
+    public ApiResponse<FollowStatsResponse> stats(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID callerId,
+            @PathVariable UUID userId) {
+        return ApiResponse.success(followService.stats(callerId, userId));
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/controller/HealthController.java

@@ -0,0 +1,36 @@
+package com.patbond.patbond.community.controller;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.Map;
+
+/**
+ * Liveness/readiness probe for the skeleton phase: confirms the service is
+ * up and that its datasource can reach the shared PostgreSQL. Deliberately
+ * outside /api/v1 so it stays unauthenticated (same reasoning as compose's
+ * pg_isready: infrastructure probes carry no business data).
+ */
+@RestController
+public class HealthController {
+
+    private final JdbcClient jdbcClient;
+
+    public HealthController(JdbcClient jdbcClient) {
+        this.jdbcClient = jdbcClient;
+    }
+
+    @GetMapping("/health")
+    public ApiResponse<Map<String, String>> health() {
+        String db;
+        try {
+            jdbcClient.sql("SELECT 1").query(Integer.class).single();
+            db = "up";
+        } catch (Exception e) {
+            db = "down";
+        }
+        return ApiResponse.success(Map.of("status", "ok", "db", db));
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/controller/InteractionController.java

@@ -0,0 +1,79 @@
+package com.patbond.patbond.community.controller;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import com.patbond.patbond.community.dto.BookmarkStateResponse;
+import com.patbond.patbond.community.dto.CursorPage;
+import com.patbond.patbond.community.dto.FeedCardResponse;
+import com.patbond.patbond.community.dto.LikeStateResponse;
+import com.patbond.patbond.community.security.BearerAuthFilter;
+import com.patbond.patbond.community.service.FeedService;
+import com.patbond.patbond.community.service.InteractionService;
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PutMapping;
+import org.springframework.web.bind.annotation.RequestAttribute;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.UUID;
+
+/**
+ * Binary post interactions (T3-06): PUT/DELETE idempotent like and
+ * bookmark, each answering the authoritative terminal state, plus the
+ * my-bookmarks list whose items reuse the feed card shape.
+ */
+@RestController
+@Validated
+public class InteractionController {
+
+    private final InteractionService interactionService;
+    private final FeedService feedService;
+
+    public InteractionController(InteractionService interactionService, FeedService feedService) {
+        this.interactionService = interactionService;
+        this.feedService = feedService;
+    }
+
+    @PutMapping("/api/v1/posts/{postId}/like")
+    public ApiResponse<LikeStateResponse> like(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID postId) {
+        return ApiResponse.success(interactionService.like(userId, postId));
+    }
+
+    @DeleteMapping("/api/v1/posts/{postId}/like")
+    public ApiResponse<LikeStateResponse> unlike(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID postId) {
+        return ApiResponse.success(interactionService.unlike(userId, postId));
+    }
+
+    @PutMapping("/api/v1/posts/{postId}/bookmark")
+    public ApiResponse<BookmarkStateResponse> bookmark(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID postId) {
+        return ApiResponse.success(interactionService.bookmark(userId, postId));
+    }
+
+    @DeleteMapping("/api/v1/posts/{postId}/bookmark")
+    public ApiResponse<BookmarkStateResponse> unbookmark(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID postId) {
+        return ApiResponse.success(interactionService.unbookmark(userId, postId));
+    }
+
+    @GetMapping("/api/v1/me/bookmarks")
+    public ApiResponse<CursorPage<FeedCardResponse>> myBookmarks(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @RequestParam(defaultValue = "20")
+            @Min(value = 1, message = "limit 最小为 1")
+            @Max(value = 100, message = "limit 最大为 100")
+            int limit,
+            @RequestParam(required = false) String cursor) {
+        return ApiResponse.success(feedService.listBookmarked(userId, limit, cursor));
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/controller/PostController.java

@@ -0,0 +1,103 @@
+package com.patbond.patbond.community.controller;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import com.patbond.patbond.community.dto.CommunityStatsResponse;
+import com.patbond.patbond.community.dto.CreatePostRequest;
+import com.patbond.patbond.community.dto.CursorPage;
+import com.patbond.patbond.community.dto.PostResponse;
+import com.patbond.patbond.community.dto.UpdatePostRequest;
+import com.patbond.patbond.community.security.BearerAuthFilter;
+import com.patbond.patbond.community.service.PostService;
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
+import org.springframework.http.HttpStatus;
+import org.springframework.validation.annotation.Validated;
+import org.springframework.web.bind.annotation.DeleteMapping;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PatchMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+import org.springframework.web.bind.annotation.PostMapping;
+import org.springframework.web.bind.annotation.RequestAttribute;
+import org.springframework.web.bind.annotation.RequestBody;
+import org.springframework.web.bind.annotation.RequestHeader;
+import org.springframework.web.bind.annotation.RequestParam;
+import org.springframework.web.bind.annotation.ResponseStatus;
+import org.springframework.web.bind.annotation.RestController;
+
+import java.util.UUID;
+
+/**
+ * Post lifecycle endpoints (T3-04). Idempotency-Key is MANDATORY on create
+ * (ADR-019 — deliberately different from the pets domain's optional key;
+ * a missing header answers 400/40000). Publishing is a PATCH state
+ * transition, not a separate endpoint. All permission and error semantics
+ * live in PostService.
+ */
+@RestController
+@Validated
+public class PostController {
+
+    private final PostService postService;
+
+    public PostController(PostService postService) {
+        this.postService = postService;
+    }
+
+    @PostMapping("/api/v1/posts")
+    @ResponseStatus(HttpStatus.CREATED)
+    public ApiResponse<PostResponse> create(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @RequestHeader("Idempotency-Key") String idempotencyKey,
+            @Valid @RequestBody CreatePostRequest request) {
+        return ApiResponse.success(postService.create(userId, idempotencyKey, request));
+    }
+
+    @GetMapping("/api/v1/posts/{postId}")
+    public ApiResponse<PostResponse> get(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID postId) {
+        return ApiResponse.success(postService.get(userId, postId));
+    }
+
+    @PatchMapping("/api/v1/posts/{postId}")
+    public ApiResponse<PostResponse> update(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID postId,
+            @Valid @RequestBody UpdatePostRequest request) {
+        return ApiResponse.success(postService.update(userId, postId, request));
+    }
+
+    @DeleteMapping("/api/v1/posts/{postId}")
+    public ApiResponse<Void> delete(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @PathVariable UUID postId) {
+        postService.delete(userId, postId);
+        return ApiResponse.success(null);
+    }
+
+    @GetMapping("/api/v1/me/posts")
+    public ApiResponse<CursorPage<PostResponse>> listMine(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId,
+            @RequestParam(required = false) String status,
+            @RequestParam(defaultValue = "20")
+            @Min(value = 1, message = "limit 最小为 1")
+            @Max(value = 100, message = "limit 最大为 100")
+            int limit,
+            @RequestParam(required = false) String cursor) {
+        return ApiResponse.success(postService.listMine(userId, status, limit, cursor));
+    }
+
+    /**
+     * The caller's own community numbers (T3.5-06, ADR-022 决策 A: a dedicated
+     * endpoint rather than an addition to /users/{userId}/follow-stats, whose
+     * subject is "some user's follow counts" — mixing "my likes received" in
+     * would give one payload two subjects). Lives here because posts are the
+     * sole source of both numbers, next to the other /me posts read.
+     */
+    @GetMapping("/api/v1/me/community-stats")
+    public ApiResponse<CommunityStatsResponse> communityStats(
+            @RequestAttribute(BearerAuthFilter.USER_ID_ATTRIBUTE) UUID userId) {
+        return ApiResponse.success(postService.communityStats(userId));
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/AuthorSummaryResponse.java

@@ -0,0 +1,21 @@
+package com.patbond.patbond.community.dto;
+
+import java.util.UUID;
+
+/**
+ * Author public summary embedded in post/feed/comment responses (D3-9).
+ * {@code nickname} carries the nickname→username fallback applied by
+ * patbond-user, so clients never assemble a display name themselves;
+ * {@code avatarUrl} is a fresh presigned GET (null when the author has no
+ * ready avatar, or when object storage is unconfigured — clients show a
+ * placeholder). The degraded shape — profile service unreachable, or the
+ * author since deleted — keeps only {@code userId} and nulls the rest
+ * (authorId 保底：the feed never 5xxes over a profile lookup).
+ */
+public record AuthorSummaryResponse(UUID userId, String nickname, String avatarUrl) {
+
+    /** The degraded / tombstone shape: id only, client renders placeholders. */
+    public static AuthorSummaryResponse idOnly(UUID userId) {
+        return new AuthorSummaryResponse(userId, null, null);
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/BookmarkStateResponse.java

@@ -0,0 +1,5 @@
+package com.patbond.patbond.community.dto;
+
+/** Authoritative post-write bookmark state — isomorphic to {@link LikeStateResponse}. */
+public record BookmarkStateResponse(boolean bookmarked, long bookmarkCount) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/CommentResponse.java

@@ -0,0 +1,19 @@
+package com.patbond.patbond.community.dto;
+
+import java.time.OffsetDateTime;
+import java.util.UUID;
+
+/**
+ * One flat comment (T3-07 定型): the author and the optional @-reply target
+ * both travel as the D3-9 AuthorSummary shape, resolved through the same
+ * batch profile gateway as posts, so a degraded profile service renders
+ * id-only summaries here too and never fails the request.
+ */
+public record CommentResponse(
+        UUID id,
+        UUID postId,
+        AuthorSummaryResponse author,
+        AuthorSummaryResponse replyToUser,
+        String content,
+        OffsetDateTime createdAt) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/CommunityStatsResponse.java

@@ -0,0 +1,22 @@
+package com.patbond.patbond.community.dto;
+
+/**
+ * GET /api/v1/me/community-stats (T3.5-06, ADR-022 决策 A) — the caller's own
+ * community numbers, read-side aggregates over community.posts with no new
+ * denormalized column.
+ *
+ * <p>Scope, frozen with this ticket: both numbers count ONLY the caller's own
+ * posts that are {@code status='published'} and not soft-deleted. Drafts are
+ * excluded (they are not works yet, and their likes cannot exist anyway),
+ * soft-deleted posts are excluded (deleting a post removes its numbers), and
+ * the operational states hidden/archived are excluded for the same reason
+ * they are invisible everywhere else in the M3 contract. Empty data yields
+ * {@code 0}, never null.</p>
+ *
+ * <p>{@code receivedLikeCount} is {@code SUM(posts.like_count)} — the counter
+ * the write side maintains in the same transaction as the like row (T3-07),
+ * so this is exact, not an estimate. A user's own likes on their own posts are
+ * counted, exactly as the per-post number shows them.</p>
+ */
+public record CommunityStatsResponse(long receivedLikeCount, long publishedPostCount) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/CreateCommentRequest.java

@@ -0,0 +1,38 @@
+package com.patbond.patbond.community.dto;
+
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Size;
+
+import java.util.UUID;
+
+/**
+ * POST /api/v1/posts/{postId}/comments. Content width mirrors
+ * ck_comments_content (1~2000 after trim); {@code replyToUserId} is the
+ * optional flat @-reply target (single level, no parentCommentId — ADR-018
+ * rules out nested threads).
+ */
+public class CreateCommentRequest {
+
+    @NotBlank(message = "content 不能为空")
+    @Size(max = 2000, message = "content 最长 2000 字符")
+    private String content;
+
+    /** Optional @-reply target; must be an existing active user (40406). */
+    private UUID replyToUserId;
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public UUID getReplyToUserId() {
+        return replyToUserId;
+    }
+
+    public void setReplyToUserId(UUID replyToUserId) {
+        this.replyToUserId = replyToUserId;
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/CreatePostRequest.java

@@ -0,0 +1,86 @@
+package com.patbond.patbond.community.dto;
+
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.NotBlank;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.Size;
+
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * POST /api/v1/posts. Field widths mirror the ck_posts_* constraints;
+ * category and status enums are the write-side whitelists (ai_creation is an
+ * M4 read-side reservation and hidden/archived are operational states with
+ * no open endpoint, D3-7).
+ */
+public class CreatePostRequest {
+
+    @Size(min = 1, max = 120, message = "title 长度须在 1~120 字符")
+    private String title;
+
+    @NotBlank(message = "content 不能为空")
+    @Size(max = 10000, message = "content 最长 10000 字符")
+    private String content;
+
+    @Pattern(regexp = "general|help", message = "category 仅支持 general/help")
+    private String category;
+
+    @Pattern(regexp = "draft|published", message = "status 仅支持 draft/published")
+    private String status;
+
+    /** Optional pet reference; must be a pet visible to the caller (40401). */
+    private UUID petId;
+
+    @Size(max = 9, message = "media 最多 9 张图")
+    @Valid
+    private List<PostMediaAttachRequest> media;
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public String getCategory() {
+        return category;
+    }
+
+    public void setCategory(String category) {
+        this.category = category;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    public UUID getPetId() {
+        return petId;
+    }
+
+    public void setPetId(UUID petId) {
+        this.petId = petId;
+    }
+
+    public List<PostMediaAttachRequest> getMedia() {
+        return media;
+    }
+
+    public void setMedia(List<PostMediaAttachRequest> media) {
+        this.media = media;
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/CursorPage.java

@@ -0,0 +1,14 @@
+package com.patbond.patbond.community.dto;
+
+import java.util.List;
+
+/**
+ * Cursor-pagination envelope body — the pagination canon of the whole API
+ * (openapi v1.2.0 通用约定): {@code nextCursor} is null exactly when
+ * {@code hasMore} is false.
+ */
+public record CursorPage<T>(
+        List<T> items,
+        String nextCursor,
+        boolean hasMore) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/FeedCardResponse.java

@@ -0,0 +1,29 @@
+package com.patbond.patbond.community.dto;
+
+import java.time.OffsetDateTime;
+import java.util.UUID;
+
+/**
+ * One public-feed card (T3-05 定型, the FeedCard freeze input): the Post
+ * shape trimmed for list rendering — content cut to a 200-code-point
+ * preview, the media set reduced to the cover item plus a count, counts
+ * read from the posts table's denormalized columns. {@code coverImage} is
+ * null exactly for text-only posts (T3-04 guarantees a unique is_cover row
+ * whenever media exist); {@code publishedAt} is never null here (the feed
+ * predicate admits published posts only).
+ */
+public record FeedCardResponse(
+        UUID id,
+        AuthorSummaryResponse author,
+        String category,
+        String title,
+        String contentPreview,
+        PostMediaItemResponse coverImage,
+        int mediaCount,
+        long likeCount,
+        long commentCount,
+        long bookmarkCount,
+        boolean likedByMe,
+        boolean bookmarkedByMe,
+        OffsetDateTime publishedAt) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/FollowStateResponse.java

@@ -0,0 +1,10 @@
+package com.patbond.patbond.community.dto;
+
+/**
+ * Authoritative post-write follow state; {@code followerCount} is the
+ * TARGET user's follower count (real-time COUNT — user_follows has no
+ * denormalized counter column, and the double index keeps both directions
+ * cheap).
+ */
+public record FollowStateResponse(boolean following, long followerCount) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/FollowStatsResponse.java

@@ -0,0 +1,9 @@
+package com.patbond.patbond.community.dto;
+
+/**
+ * GET /api/v1/users/{userId}/follow-stats — the ADR-018 minimal "numbers"
+ * endpoint. {@code followedByMe} is the caller's view; asking about oneself
+ * yields false (a self-follow row cannot exist, ck_user_follows_self).
+ */
+public record FollowStatsResponse(long followerCount, long followingCount, boolean followedByMe) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/LikeStateResponse.java

@@ -0,0 +1,10 @@
+package com.patbond.patbond.community.dto;
+
+/**
+ * Authoritative post-write like state (草案定型): a PUT answers
+ * {@code liked=true} and a DELETE {@code liked=false} regardless of whether
+ * the call changed anything; {@code likeCount} is the count as of this
+ * write's transaction, the value optimistic clients reconcile against.
+ */
+public record LikeStateResponse(boolean liked, long likeCount) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/PostMediaAttachRequest.java

@@ -0,0 +1,66 @@
+package com.patbond.patbond.community.dto;
+
+import jakarta.validation.constraints.Max;
+import jakarta.validation.constraints.Min;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Size;
+
+import java.util.UUID;
+
+/**
+ * One attached image in a create/update request. The asset must be owned by
+ * the caller and {@code status='ready'} (T3-03 联调协议), enforced in
+ * PostService against a read-only view of media.assets.
+ */
+public class PostMediaAttachRequest {
+
+    @NotNull(message = "assetId 不能为空")
+    private UUID assetId;
+
+    /**
+     * 0-based position. Either every item carries a position (together
+     * forming exactly 0..n-1) or none does (array order applies) — a mix is
+     * a 40000.
+     */
+    @Min(value = 0, message = "position 最小为 0")
+    @Max(value = 8, message = "position 最大为 8")
+    private Integer position;
+
+    /** At most one true per post (uq_post_media_cover); none → position 0. */
+    private Boolean isCover;
+
+    @Size(max = 300, message = "caption 最长 300 字符")
+    private String caption;
+
+    public UUID getAssetId() {
+        return assetId;
+    }
+
+    public void setAssetId(UUID assetId) {
+        this.assetId = assetId;
+    }
+
+    public Integer getPosition() {
+        return position;
+    }
+
+    public void setPosition(Integer position) {
+        this.position = position;
+    }
+
+    public Boolean getIsCover() {
+        return isCover;
+    }
+
+    public void setIsCover(Boolean isCover) {
+        this.isCover = isCover;
+    }
+
+    public String getCaption() {
+        return caption;
+    }
+
+    public void setCaption(String caption) {
+        this.caption = caption;
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/PostMediaItemResponse.java

@@ -0,0 +1,18 @@
+package com.patbond.patbond.community.dto;
+
+import java.util.UUID;
+
+/**
+ * One attached image in a post response. {@code url} is a presigned GET URL
+ * signed per response (T3-03: the bucket stays private, clients never
+ * persist it); null when object storage is unconfigured in this service.
+ */
+public record PostMediaItemResponse(
+        UUID assetId,
+        int position,
+        boolean isCover,
+        String url,
+        Integer widthPx,
+        Integer heightPx,
+        String caption) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/PostResponse.java

@@ -0,0 +1,34 @@
+package com.patbond.patbond.community.dto;
+
+import java.time.OffsetDateTime;
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * Full post shape (detail / my-posts list / write responses). The T3-04
+ * {@code authorId} placeholder is gone: {@code author} is the D3-9
+ * AuthorSummary, degraded to its id-only shape when the profile lookup is
+ * unavailable (contract deviation #1 closed by T3-05). Trimmed fields
+ * (region/generationJob/topics …) do not appear at all (ADR-018 + ADR-010
+ * precedent).
+ */
+public record PostResponse(
+        UUID id,
+        AuthorSummaryResponse author,
+        UUID petId,
+        String category,
+        String title,
+        String content,
+        String status,
+        String visibility,
+        List<PostMediaItemResponse> media,
+        long likeCount,
+        long commentCount,
+        long bookmarkCount,
+        boolean likedByMe,
+        boolean bookmarkedByMe,
+        OffsetDateTime createdAt,
+        OffsetDateTime updatedAt,
+        OffsetDateTime publishedAt,
+        int version) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/dto/UpdatePostRequest.java

@@ -0,0 +1,100 @@
+package com.patbond.patbond.community.dto;
+
+import jakarta.validation.Valid;
+import jakarta.validation.constraints.NotNull;
+import jakarta.validation.constraints.Pattern;
+import jakarta.validation.constraints.PositiveOrZero;
+import jakarta.validation.constraints.Size;
+
+import java.util.List;
+import java.util.UUID;
+
+/**
+ * PATCH /api/v1/posts/{postId}. Partial update: an absent (or null) field is
+ * left unchanged — no clearing back to null (M2 惯例). {@code version} is
+ * mandatory, it is the optimistic lock. {@code status} accepts only
+ * "published": draft→published is the single open state transition (发布即
+ * 状态迁移, no separate /publish endpoint); publishing an already-published
+ * post is a no-op. {@code media}, when present, replaces the whole set
+ * (整组替换).
+ */
+public class UpdatePostRequest {
+
+    @NotNull(message = "version 不能为空")
+    @PositiveOrZero(message = "version 必须为非负整数")
+    private Integer version;
+
+    @Size(min = 1, max = 120, message = "title 长度须在 1~120 字符")
+    private String title;
+
+    @Size(min = 1, max = 10000, message = "content 长度须在 1~10000 字符")
+    private String content;
+
+    @Pattern(regexp = "general|help", message = "category 仅支持 general/help")
+    private String category;
+
+    private UUID petId;
+
+    @Pattern(regexp = "published", message = "status 仅支持 published（唯一开放的状态迁移）")
+    private String status;
+
+    @Size(max = 9, message = "media 最多 9 张图")
+    @Valid
+    private List<PostMediaAttachRequest> media;
+
+    public Integer getVersion() {
+        return version;
+    }
+
+    public void setVersion(Integer version) {
+        this.version = version;
+    }
+
+    public String getTitle() {
+        return title;
+    }
+
+    public void setTitle(String title) {
+        this.title = title;
+    }
+
+    public String getContent() {
+        return content;
+    }
+
+    public void setContent(String content) {
+        this.content = content;
+    }
+
+    public String getCategory() {
+        return category;
+    }
+
+    public void setCategory(String category) {
+        this.category = category;
+    }
+
+    public UUID getPetId() {
+        return petId;
+    }
+
+    public void setPetId(UUID petId) {
+        this.petId = petId;
+    }
+
+    public String getStatus() {
+        return status;
+    }
+
+    public void setStatus(String status) {
+        this.status = status;
+    }
+
+    public List<PostMediaAttachRequest> getMedia() {
+        return media;
+    }
+
+    public void setMedia(List<PostMediaAttachRequest> media) {
+        this.media = media;
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/media/CommunityMediaProperties.java

@@ -0,0 +1,79 @@
+package com.patbond.patbond.community.media;
+
+import org.springframework.boot.context.properties.ConfigurationProperties;
+
+import java.time.Duration;
+
+/**
+ * Read-side subset of the media object-storage configuration (the write
+ * side — upload flow, whitelists — lives in patbond-user's MediaProperties).
+ * This service only signs GET URLs, a purely local SigV4 computation, so no
+ * bucket/HEAD client is needed. Values reuse the same PATBOND_MINIO_* /
+ * PATBOND_MEDIA_* environment variables as patbond-user, keeping one set of
+ * knobs per deployment (ADR-016/021).
+ */
+@ConfigurationProperties(prefix = "patbond.media")
+public class CommunityMediaProperties {
+
+    /**
+     * Endpoint presigned GET URLs are issued against — the address CLIENTS
+     * can reach. Empty means media is unconfigured for this service:
+     * responses carry {@code url: null} (same degradation precedent as the
+     * missing JWT public key).
+     */
+    private String publicEndpoint = "";
+
+    /** S3 access key; injected via environment, never committed (ADR-021). */
+    private String accessKey = "";
+
+    /** S3 secret key; injected via environment, never committed (ADR-021). */
+    private String secretKey = "";
+
+    /** SigV4 region; MinIO accepts any value, cloud stores need the real one. */
+    private String region = "us-east-1";
+
+    /** TTL of presigned GET URLs (the bucket stays private, T3-03 定型). */
+    private Duration downloadTtl = Duration.ofHours(1);
+
+    public String getPublicEndpoint() {
+        return publicEndpoint;
+    }
+
+    public void setPublicEndpoint(String publicEndpoint) {
+        this.publicEndpoint = publicEndpoint;
+    }
+
+    public String getAccessKey() {
+        return accessKey;
+    }
+
+    // setter 形参名取 value：check-secrets 的 KEY-ASSIGN 规则会把「字段 = 同名
+    // 形参」的自赋值误报为凭证字面量，规则表三仓同构不单方面改（ADR-021）
+    public void setAccessKey(String value) {
+        this.accessKey = value;
+    }
+
+    public String getSecretKey() {
+        return secretKey;
+    }
+
+    public void setSecretKey(String value) {
+        this.secretKey = value;
+    }
+
+    public String getRegion() {
+        return region;
+    }
+
+    public void setRegion(String region) {
+        this.region = region;
+    }
+
+    public Duration getDownloadTtl() {
+        return downloadTtl;
+    }
+
+    public void setDownloadTtl(Duration downloadTtl) {
+        this.downloadTtl = downloadTtl;
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/media/MediaAssetGateway.java

@@ -0,0 +1,59 @@
+package com.patbond.patbond.community.media;
+
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.Collection;
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.function.Function;
+import java.util.stream.Collectors;
+
+/**
+ * Read-only cross-schema access to media.assets — the community side of the
+ * T3-03 联调协议 (business references accept only assets owned by the caller
+ * with status='ready'). Same-database read was chosen over an internal HTTP
+ * call to patbond-user (ADR-017 precedent: author data is likewise a
+ * cross-schema read while the schemas share one database; splitting the
+ * database later moves both to internal APIs together). This class never
+ * writes media.assets — the media state machine belongs to patbond-user.
+ */
+@Repository
+public class MediaAssetGateway {
+
+    private final JdbcClient jdbcClient;
+
+    public MediaAssetGateway(JdbcClient jdbcClient) {
+        this.jdbcClient = jdbcClient;
+    }
+
+    public Map<UUID, MediaAssetRef> findByIds(Collection<UUID> ids) {
+        if (ids.isEmpty()) {
+            return Map.of();
+        }
+        return jdbcClient.sql("""
+                        SELECT id, owner_user_id, status, bucket, object_key, width_px, height_px
+                        FROM media.assets
+                        WHERE id IN (:ids)
+                        """)
+                .param("ids", List.copyOf(ids))
+                .query(MediaAssetGateway::mapRef)
+                .list()
+                .stream()
+                .collect(Collectors.toMap(MediaAssetRef::id, Function.identity()));
+    }
+
+    private static MediaAssetRef mapRef(ResultSet rs, int rowNum) throws SQLException {
+        return new MediaAssetRef(
+                rs.getObject("id", UUID.class),
+                rs.getObject("owner_user_id", UUID.class),
+                rs.getString("status"),
+                rs.getString("bucket"),
+                rs.getString("object_key"),
+                rs.getObject("width_px", Integer.class),
+                rs.getObject("height_px", Integer.class));
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/media/MediaAssetRef.java

@@ -0,0 +1,17 @@
+package com.patbond.patbond.community.media;
+
+import java.util.UUID;
+
+/**
+ * Read-only view of one media.assets row — exactly the columns the post
+ * domain needs for attach validation and response URL signing.
+ */
+public record MediaAssetRef(
+        UUID id,
+        UUID ownerUserId,
+        String status,
+        String bucket,
+        String objectKey,
+        Integer widthPx,
+        Integer heightPx) {
+}

patbond-community/src/main/java/com/patbond/patbond/community/media/MediaUrlSigner.java

@@ -0,0 +1,61 @@
+package com.patbond.patbond.community.media;
+
+import software.amazon.awssdk.auth.credentials.AwsBasicCredentials;
+import software.amazon.awssdk.auth.credentials.StaticCredentialsProvider;
+import software.amazon.awssdk.regions.Region;
+import software.amazon.awssdk.services.s3.S3Configuration;
+import software.amazon.awssdk.services.s3.presigner.S3Presigner;
+import software.amazon.awssdk.services.s3.presigner.model.GetObjectPresignRequest;
+
+import java.net.URI;
+
+/**
+ * Signs presigned GET URLs for media objects referenced by posts (T3-03
+ * 定型：private bucket + presigned GET, TTL configurable, signed fresh on
+ * every response — clients never persist the URL). Presigning is a local
+ * SigV4 computation against the public endpoint; this service never talks
+ * to the object store itself. Path-style addressing is forced because MinIO
+ * has no wildcard DNS for virtual-host-style buckets (same as
+ * patbond-user's S3ObjectStorage). When unconfigured, {@link #signGet}
+ * returns null and post responses degrade to {@code url: null}.
+ */
+public class MediaUrlSigner implements AutoCloseable {
+
+    private final CommunityMediaProperties properties;
+    private final S3Presigner presigner;
+
+    public MediaUrlSigner(CommunityMediaProperties properties) {
+        this.properties = properties;
+        if (properties.getPublicEndpoint().isBlank()) {
+            this.presigner = null;
+            return;
+        }
+        this.presigner = S3Presigner.builder()
+                .endpointOverride(URI.create(properties.getPublicEndpoint()))
+                .region(Region.of(properties.getRegion()))
+                .credentialsProvider(StaticCredentialsProvider.create(
+                        AwsBasicCredentials.create(properties.getAccessKey(), properties.getSecretKey())))
+                .serviceConfiguration(S3Configuration.builder().pathStyleAccessEnabled(true).build())
+                .build();
+    }
+
+    /** @return a presigned GET URL, or null when storage is unconfigured */
+    public String signGet(String bucket, String objectKey) {
+        if (presigner == null || bucket == null || objectKey == null) {
+            return null;
+        }
+        return presigner.presignGetObject(GetObjectPresignRequest.builder()
+                        .signatureDuration(properties.getDownloadTtl())
+                        .getObjectRequest(b -> b.bucket(bucket).key(objectKey))
+                        .build())
+                .url()
+                .toString();
+    }
+
+    @Override
+    public void close() {
+        if (presigner != null) {
+            presigner.close();
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/repository/CommentRepository.java

@@ -0,0 +1,145 @@
+package com.patbond.patbond.community.repository;
+
+import com.patbond.patbond.community.support.CommentCursor;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.time.OffsetDateTime;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * community.comments access. Post visibility and authorship decisions live
+ * in CommentService; every query here filters on the comment's own state
+ * only (status='visible' is the single liveness predicate — 'hidden' has no
+ * producing endpoint in M3 and 'deleted' pairs with deleted_at,
+ * ck_comments_deleted).
+ */
+@Repository
+public class CommentRepository {
+
+    private static final String SELECT_COMMENT = """
+            SELECT c.id, c.post_id, c.author_user_id, c.reply_to_user_id, c.content,
+                   c.status, c.request_hash, c.created_at, c.deleted_at
+            FROM community.comments c
+            """;
+
+    private final JdbcClient jdbcClient;
+
+    public CommentRepository(JdbcClient jdbcClient) {
+        this.jdbcClient = jdbcClient;
+    }
+
+    /**
+     * Inserts one comment; the conflict target is the (author_user_id,
+     * client_request_id) unique constraint, so a keyed replay is a no-op and
+     * the caller settles retry-vs-mismatch on the stored request_hash
+     * (ADR-019, same shape as posts).
+     *
+     * @return rows inserted — 0 means this author already used the key
+     */
+    public int insertComment(UUID id, UUID postId, UUID authorUserId, UUID replyToUserId,
+                             String content, String clientRequestId, byte[] requestHash) {
+        return jdbcClient.sql("""
+                        INSERT INTO community.comments
+                            (id, post_id, author_user_id, reply_to_user_id, content,
+                             client_request_id, request_hash)
+                        VALUES (:id, :postId, :authorUserId, :replyToUserId, :content,
+                                :clientRequestId, :requestHash)
+                        ON CONFLICT (author_user_id, client_request_id) DO NOTHING
+                        """)
+                .param("id", id)
+                .param("postId", postId)
+                .param("authorUserId", authorUserId)
+                .param("replyToUserId", replyToUserId)
+                .param("content", content)
+                .param("clientRequestId", clientRequestId)
+                .param("requestHash", requestHash)
+                .update();
+    }
+
+    /** First-write row for a (author, Idempotency-Key) pair, deleted or not. */
+    public Optional<CommentRow> findByAuthorAndClientRequestId(UUID authorUserId,
+                                                               String clientRequestId) {
+        return jdbcClient.sql(SELECT_COMMENT
+                        + " WHERE c.author_user_id = :authorUserId"
+                        + " AND c.client_request_id = :clientRequestId")
+                .param("authorUserId", authorUserId)
+                .param("clientRequestId", clientRequestId)
+                .query(CommentRepository::mapComment)
+                .optional();
+    }
+
+    /**
+     * Locks the visible row for the delete transition: concurrent deletes
+     * of the same comment serialize here, so the status flip — and with it
+     * the comment_count decrement — happens exactly once.
+     */
+    public Optional<CommentRow> lockVisibleById(UUID id) {
+        return jdbcClient.sql(SELECT_COMMENT + " WHERE c.id = :id AND c.status = 'visible' FOR UPDATE")
+                .param("id", id)
+                .query(CommentRepository::mapComment)
+                .optional();
+    }
+
+    /** The soft-delete transition; deleted_at pairs with status (ck_comments_deleted). */
+    public int softDelete(UUID id) {
+        return jdbcClient.sql("""
+                        UPDATE community.comments
+                        SET status = 'deleted', deleted_at = now()
+                        WHERE id = :id AND status = 'visible'
+                        """)
+                .param("id", id)
+                .update();
+    }
+
+    /**
+     * One page of a post's visible comments in (created_at DESC, id DESC) —
+     * the exact key of ix_comments_post_created. The caller asks for
+     * limit+1 rows to learn whether more exist.
+     */
+    public List<CommentRow> pageByPost(UUID postId, CommentCursor after, int limitPlusOne) {
+        String sql = SELECT_COMMENT + " WHERE c.post_id = :postId AND c.status = 'visible'";
+        if (after != null) {
+            sql += " AND (c.created_at, c.id) < (:cursorCreatedAt, :cursorId)";
+        }
+        sql += " ORDER BY c.created_at DESC, c.id DESC LIMIT :limit";
+        var spec = jdbcClient.sql(sql)
+                .param("postId", postId)
+                .param("limit", limitPlusOne);
+        if (after != null) {
+            spec = spec.param("cursorCreatedAt", after.createdAt())
+                    .param("cursorId", after.id());
+        }
+        return spec.query(CommentRepository::mapComment).list();
+    }
+
+    private static CommentRow mapComment(ResultSet rs, int rowNum) throws SQLException {
+        return new CommentRow(
+                rs.getObject("id", UUID.class),
+                rs.getObject("post_id", UUID.class),
+                rs.getObject("author_user_id", UUID.class),
+                rs.getObject("reply_to_user_id", UUID.class),
+                rs.getString("content"),
+                rs.getString("status"),
+                rs.getBytes("request_hash"),
+                rs.getObject("created_at", OffsetDateTime.class),
+                rs.getObject("deleted_at", OffsetDateTime.class));
+    }
+
+    /** One comments row; requestHash carries the ADR-019 replay comparison. */
+    public record CommentRow(
+            UUID id,
+            UUID postId,
+            UUID authorUserId,
+            UUID replyToUserId,
+            String content,
+            String status,
+            byte[] requestHash,
+            OffsetDateTime createdAt,
+            OffsetDateTime deletedAt) {
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/repository/InteractionRepository.java

@@ -0,0 +1,202 @@
+package com.patbond.patbond.community.repository;
+
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.util.UUID;
+
+/**
+ * community.post_likes / post_bookmarks / user_follows access, plus the
+ * denormalized counter writes on community.posts. The invariant every
+ * caller must hold (工单验收硬项): a counter column moves IN THE SAME
+ * TRANSACTION as its relation row, and only by the number of rows the
+ * relation write actually changed — {@code ON CONFLICT DO NOTHING} inserts
+ * and conditional deletes report that number, so concurrent duplicates
+ * converge on the composite primary key and never double-count.
+ */
+@Repository
+public class InteractionRepository {
+
+    private final JdbcClient jdbcClient;
+
+    public InteractionRepository(JdbcClient jdbcClient) {
+        this.jdbcClient = jdbcClient;
+    }
+
+    /**
+     * The interaction gate: likes, bookmarks and comments attach to the
+     * PUBLIC face of a post only — published and live. Drafts (the
+     * author's own included), hidden/archived and soft-deleted posts all
+     * fail this probe and answer the byte-identical 404/40403.
+     */
+    public boolean isInteractable(UUID postId) {
+        return jdbcClient.sql("""
+                        SELECT EXISTS (SELECT 1 FROM community.posts
+                                       WHERE id = :id AND status = 'published'
+                                       AND deleted_at IS NULL)
+                        """)
+                .param("id", postId)
+                .query(Boolean.class)
+                .single();
+    }
+
+    /** @return rows inserted — 0 when the like already existed */
+    public int insertLike(UUID postId, UUID userId) {
+        return jdbcClient.sql("""
+                        INSERT INTO community.post_likes (post_id, user_id)
+                        VALUES (:postId, :userId)
+                        ON CONFLICT (post_id, user_id) DO NOTHING
+                        """)
+                .param("postId", postId)
+                .param("userId", userId)
+                .update();
+    }
+
+    /** @return rows deleted — 0 when there was nothing to cancel */
+    public int deleteLike(UUID postId, UUID userId) {
+        return jdbcClient.sql("""
+                        DELETE FROM community.post_likes
+                        WHERE post_id = :postId AND user_id = :userId
+                        """)
+                .param("postId", postId)
+                .param("userId", userId)
+                .update();
+    }
+
+    /** @return rows inserted — 0 when the bookmark already existed */
+    public int insertBookmark(UUID postId, UUID userId) {
+        return jdbcClient.sql("""
+                        INSERT INTO community.post_bookmarks (post_id, user_id)
+                        VALUES (:postId, :userId)
+                        ON CONFLICT (post_id, user_id) DO NOTHING
+                        """)
+                .param("postId", postId)
+                .param("userId", userId)
+                .update();
+    }
+
+    /** @return rows deleted — 0 when there was nothing to cancel */
+    public int deleteBookmark(UUID postId, UUID userId) {
+        return jdbcClient.sql("""
+                        DELETE FROM community.post_bookmarks
+                        WHERE post_id = :postId AND user_id = :userId
+                        """)
+                .param("postId", postId)
+                .param("userId", userId)
+                .update();
+    }
+
+    /**
+     * Moves like_count by delta and returns the resulting value — the
+     * authoritative count the write response carries. Callers pass the row
+     * count their relation write reported; a zero delta must instead read
+     * via {@link #likeCount} so a no-op replay takes no row lock and does
+     * not touch updated_at.
+     */
+    public long bumpLikeCount(UUID postId, int delta) {
+        return jdbcClient.sql("""
+                        UPDATE community.posts SET like_count = like_count + :delta
+                        WHERE id = :id
+                        RETURNING like_count
+                        """)
+                .param("id", postId)
+                .param("delta", delta)
+                .query(Long.class)
+                .single();
+    }
+
+    public long bumpBookmarkCount(UUID postId, int delta) {
+        return jdbcClient.sql("""
+                        UPDATE community.posts SET bookmark_count = bookmark_count + :delta
+                        WHERE id = :id
+                        RETURNING bookmark_count
+                        """)
+                .param("id", postId)
+                .param("delta", delta)
+                .query(Long.class)
+                .single();
+    }
+
+    public long bumpCommentCount(UUID postId, int delta) {
+        return jdbcClient.sql("""
+                        UPDATE community.posts SET comment_count = comment_count + :delta
+                        WHERE id = :id
+                        RETURNING comment_count
+                        """)
+                .param("id", postId)
+                .param("delta", delta)
+                .query(Long.class)
+                .single();
+    }
+
+    public long likeCount(UUID postId) {
+        return jdbcClient.sql("SELECT like_count FROM community.posts WHERE id = :id")
+                .param("id", postId)
+                .query(Long.class)
+                .single();
+    }
+
+    public long bookmarkCount(UUID postId) {
+        return jdbcClient.sql("SELECT bookmark_count FROM community.posts WHERE id = :id")
+                .param("id", postId)
+                .query(Long.class)
+                .single();
+    }
+
+    /** @return rows inserted — 0 when the follow already existed */
+    public int insertFollow(UUID followerUserId, UUID followeeUserId) {
+        return jdbcClient.sql("""
+                        INSERT INTO community.user_follows (follower_user_id, followee_user_id)
+                        VALUES (:follower, :followee)
+                        ON CONFLICT (follower_user_id, followee_user_id) DO NOTHING
+                        """)
+                .param("follower", followerUserId)
+                .param("followee", followeeUserId)
+                .update();
+    }
+
+    /** @return rows deleted — 0 when there was nothing to cancel */
+    public int deleteFollow(UUID followerUserId, UUID followeeUserId) {
+        return jdbcClient.sql("""
+                        DELETE FROM community.user_follows
+                        WHERE follower_user_id = :follower AND followee_user_id = :followee
+                        """)
+                .param("follower", followerUserId)
+                .param("followee", followeeUserId)
+                .update();
+    }
+
+    /** Real-time follower count of a user — ix_user_follows_followee. */
+    public long countFollowers(UUID userId) {
+        return jdbcClient.sql("""
+                        SELECT count(*) FROM community.user_follows
+                        WHERE followee_user_id = :userId
+                        """)
+                .param("userId", userId)
+                .query(Long.class)
+                .single();
+    }
+
+    /** Real-time following count of a user — the primary key prefix. */
+    public long countFollowing(UUID userId) {
+        return jdbcClient.sql("""
+                        SELECT count(*) FROM community.user_follows
+                        WHERE follower_user_id = :userId
+                        """)
+                .param("userId", userId)
+                .query(Long.class)
+                .single();
+    }
+
+    public boolean followExists(UUID followerUserId, UUID followeeUserId) {
+        return jdbcClient.sql("""
+                        SELECT EXISTS (SELECT 1 FROM community.user_follows
+                                       WHERE follower_user_id = :follower
+                                       AND followee_user_id = :followee)
+                        """)
+                .param("follower", followerUserId)
+                .param("followee", followeeUserId)
+                .query(Boolean.class)
+                .single();
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/repository/PostRepository.java

@@ -0,0 +1,424 @@
+package com.patbond.patbond.community.repository;
+
+import com.patbond.patbond.community.dto.CommunityStatsResponse;
+import com.patbond.patbond.community.support.BookmarkCursor;
+import com.patbond.patbond.community.support.FeedCursor;
+import com.patbond.patbond.community.support.PostCursor;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.stereotype.Repository;
+
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.time.OffsetDateTime;
+import java.util.Collection;
+import java.util.List;
+import java.util.Optional;
+import java.util.UUID;
+
+/**
+ * community.posts / community.post_media access. Visibility and authorship
+ * decisions live in PostService — every query here is still explicitly
+ * scoped (viewer-dependent flags are parameters, never session state).
+ */
+@Repository
+public class PostRepository {
+
+    /**
+     * The full post projection: row columns plus the two viewer-relative
+     * flags, each a primary-key probe into its relation table (post_likes /
+     * post_bookmarks composite PKs), so no N+1 and no separate round trip.
+     */
+    private static final String SELECT_POST = """
+            SELECT p.id, p.author_user_id, p.pet_id, p.category, p.title, p.content,
+                   p.status, p.visibility, p.like_count, p.comment_count, p.bookmark_count,
+                   p.created_at, p.updated_at, p.published_at, p.deleted_at, p.version, p.request_hash,
+                   EXISTS (SELECT 1 FROM community.post_likes pl
+                           WHERE pl.post_id = p.id AND pl.user_id = :viewerId) AS liked_by_me,
+                   EXISTS (SELECT 1 FROM community.post_bookmarks pb
+                           WHERE pb.post_id = p.id AND pb.user_id = :viewerId) AS bookmarked_by_me
+            FROM community.posts p
+            """;
+
+    private final JdbcClient jdbcClient;
+
+    public PostRepository(JdbcClient jdbcClient) {
+        this.jdbcClient = jdbcClient;
+    }
+
+    /**
+     * Inserts one post; {@code ON CONFLICT ON CONSTRAINT
+     * uq_posts_author_idempotency DO NOTHING} makes a keyed replay a no-op —
+     * the caller then loads the first-write row by (author, key) and settles
+     * the retry-vs-mismatch question on request_hash (ADR-019).
+     *
+     * @return rows inserted — 0 means this author already used the key
+     */
+    public int insertPost(UUID id, UUID authorUserId, UUID petId, String category, String title,
+                          String content, String status, OffsetDateTime publishedAt,
+                          String idempotencyKey, byte[] requestHash) {
+        return jdbcClient.sql("""
+                        INSERT INTO community.posts
+                            (id, author_user_id, pet_id, category, title, content, status,
+                             published_at, idempotency_key, request_hash)
+                        VALUES (:id, :authorUserId, :petId, :category, :title, :content, :status,
+                                :publishedAt, :idempotencyKey, :requestHash)
+                        ON CONFLICT ON CONSTRAINT uq_posts_author_idempotency DO NOTHING
+                        """)
+                .param("id", id)
+                .param("authorUserId", authorUserId)
+                .param("petId", petId)
+                .param("category", category)
+                .param("title", title)
+                .param("content", content)
+                .param("status", status)
+                .param("publishedAt", publishedAt)
+                .param("idempotencyKey", idempotencyKey)
+                .param("requestHash", requestHash)
+                .update();
+    }
+
+    /** First-write row for a (author, Idempotency-Key) pair, deleted or not. */
+    public Optional<PostRow> findByAuthorAndIdempotencyKey(UUID authorUserId, String idempotencyKey,
+                                                           UUID viewerId) {
+        return jdbcClient.sql(SELECT_POST
+                        + " WHERE p.author_user_id = :authorUserId AND p.idempotency_key = :idempotencyKey")
+                .param("authorUserId", authorUserId)
+                .param("idempotencyKey", idempotencyKey)
+                .param("viewerId", viewerId)
+                .query(PostRepository::mapPost)
+                .optional();
+    }
+
+    /** Any live (not soft-deleted) row by id; visibility is the service's call. */
+    public Optional<PostRow> findLiveById(UUID id, UUID viewerId) {
+        return jdbcClient.sql(SELECT_POST + " WHERE p.id = :id AND p.deleted_at IS NULL")
+                .param("id", id)
+                .param("viewerId", viewerId)
+                .query(PostRepository::mapPost)
+                .optional();
+    }
+
+    /**
+     * Locks the live row for a write (PATCH/DELETE): concurrent writers
+     * serialize here, so the later one sees the earlier one's version bump
+     * and fails its version condition deterministically.
+     */
+    public Optional<LockedPost> lockLiveById(UUID id) {
+        return jdbcClient.sql("""
+                        SELECT id, author_user_id, pet_id, category, title, content, status,
+                               published_at, version
+                        FROM community.posts
+                        WHERE id = :id AND deleted_at IS NULL
+                        FOR UPDATE
+                        """)
+                .param("id", id)
+                .query((rs, rowNum) -> new LockedPost(
+                        rs.getObject("id", UUID.class),
+                        rs.getObject("author_user_id", UUID.class),
+                        rs.getObject("pet_id", UUID.class),
+                        rs.getString("category"),
+                        rs.getString("title"),
+                        rs.getString("content"),
+                        rs.getString("status"),
+                        rs.getObject("published_at", OffsetDateTime.class),
+                        rs.getInt("version")))
+                .optional();
+    }
+
+    /**
+     * The optimistic-locked merge write: one conditional UPDATE, version
+     * bumped only when the expected version still stands.
+     *
+     * @return rows updated — 0 means the version went stale
+     */
+    public int updatePost(UUID id, int expectedVersion, UUID petId, String category, String title,
+                          String content, String status, OffsetDateTime publishedAt) {
+        return jdbcClient.sql("""
+                        UPDATE community.posts
+                        SET pet_id = :petId, category = :category, title = :title,
+                            content = :content, status = :status, published_at = :publishedAt,
+                            version = version + 1
+                        WHERE id = :id AND deleted_at IS NULL AND version = :expectedVersion
+                        """)
+                .param("id", id)
+                .param("expectedVersion", expectedVersion)
+                .param("petId", petId)
+                .param("category", category)
+                .param("title", title)
+                .param("content", content)
+                .param("status", status)
+                .param("publishedAt", publishedAt)
+                .update();
+    }
+
+    /**
+     * Soft delete (deleted_at is THE deletion marker everywhere). A deleted
+     * published post must also leave status='published' to satisfy
+     * ck_posts_publish_state, so it is parked as 'archived'; drafts keep
+     * their status. Once deleted the post answers 404 on every read path,
+     * so the parked status is internal bookkeeping only (D3-7 定型).
+     */
+    public int softDelete(UUID id) {
+        return jdbcClient.sql("""
+                        UPDATE community.posts
+                        SET deleted_at = now(),
+                            status = CASE WHEN status = 'published' THEN 'archived' ELSE status END,
+                            version = version + 1
+                        WHERE id = :id AND deleted_at IS NULL
+                        """)
+                .param("id", id)
+                .update();
+    }
+
+    /**
+     * The author's own community aggregates in one indexed pass over
+     * ix_posts_author_created's leading column (T3.5-06, ADR-022: read-side
+     * aggregation, no denormalized column). {@code COALESCE} turns the empty
+     * SUM into 0 so the endpoint never answers null; the
+     * {@code deleted_at IS NULL} predicate is belt-and-braces — softDelete
+     * parks published rows as 'archived', so status='published' already
+     * implies live (ck_posts_publish_state).
+     */
+    public CommunityStatsResponse aggregateByAuthor(UUID authorUserId) {
+        return jdbcClient.sql("""
+                        SELECT COALESCE(SUM(like_count), 0) AS received_like_count,
+                               COUNT(*) AS published_post_count
+                        FROM community.posts
+                        WHERE author_user_id = :authorUserId
+                          AND status = 'published'
+                          AND deleted_at IS NULL
+                        """)
+                .param("authorUserId", authorUserId)
+                .query((rs, rowNum) -> new CommunityStatsResponse(
+                        rs.getLong("received_like_count"),
+                        rs.getLong("published_post_count")))
+                .single();
+    }
+
+    /**
+     * One page of the author's own posts in (created_at DESC, id DESC) — the
+     * exact key of ix_posts_author_created. Soft-deleted rows never appear;
+     * hidden/archived are excluded (the contract exposes draft/published
+     * only). The caller asks for limit+1 rows to learn whether more exist.
+     */
+    public List<PostRow> pageByAuthor(UUID authorUserId, String statusFilter, PostCursor after,
+                                      int limitPlusOne) {
+        String sql = SELECT_POST + """
+                 WHERE p.author_user_id = :authorUserId AND p.deleted_at IS NULL
+                 AND p.status IN ('draft', 'published')
+                """;
+        if (statusFilter != null) {
+            sql += " AND p.status = :statusFilter";
+        }
+        if (after != null) {
+            sql += " AND (p.created_at, p.id) < (:cursorCreatedAt, :cursorId)";
+        }
+        sql += " ORDER BY p.created_at DESC, p.id DESC LIMIT :limit";
+        var spec = jdbcClient.sql(sql)
+                .param("authorUserId", authorUserId)
+                .param("viewerId", authorUserId)
+                .param("limit", limitPlusOne);
+        if (statusFilter != null) {
+            spec = spec.param("statusFilter", statusFilter);
+        }
+        if (after != null) {
+            spec = spec.param("cursorCreatedAt", after.createdAt())
+                    .param("cursorId", after.id());
+        }
+        return spec.query(PostRepository::mapPost).list();
+    }
+
+    /**
+     * One public-feed page in (published_at DESC, id DESC) — the exact key
+     * and predicate of the ix_posts_feed partial index. The explicit
+     * {@code deleted_at IS NULL} is belt-and-braces: softDelete parks
+     * published rows as 'archived', so status='published' already implies
+     * live (ck_posts_publish_state), and the planner still matches the
+     * partial index. The caller asks for limit+1 rows to learn whether more
+     * exist.
+     */
+    public List<PostRow> pageFeed(UUID viewerId, FeedCursor after, int limitPlusOne) {
+        String sql = SELECT_POST + """
+                 WHERE p.status = 'published' AND p.visibility = 'public'
+                 AND p.deleted_at IS NULL
+                """;
+        if (after != null) {
+            sql += " AND (p.published_at, p.id) < (:cursorPublishedAt, :cursorId)";
+        }
+        sql += " ORDER BY p.published_at DESC, p.id DESC LIMIT :limit";
+        var spec = jdbcClient.sql(sql)
+                .param("viewerId", viewerId)
+                .param("limit", limitPlusOne);
+        if (after != null) {
+            spec = spec.param("cursorPublishedAt", after.publishedAt())
+                    .param("cursorId", after.id());
+        }
+        return spec.query(PostRepository::mapPost).list();
+    }
+
+    /**
+     * One my-bookmarks page in (bookmarks.created_at DESC, post_id DESC) —
+     * the exact key of ix_post_bookmarks_user_created. Bookmarked posts
+     * that turned invisible (deleted, hidden/archived, non-public) are
+     * filtered INSIDE the keyset query（草案「静默剔除」定型）: the cursor
+     * keys on the relation row, so dropped posts cost nothing to
+     * pagination correctness. The caller asks for limit+1 rows to learn
+     * whether more exist.
+     */
+    public List<BookmarkedPostRow> pageBookmarked(UUID userId, BookmarkCursor after,
+                                                  int limitPlusOne) {
+        String sql = """
+                SELECT p.id, p.author_user_id, p.pet_id, p.category, p.title, p.content,
+                       p.status, p.visibility, p.like_count, p.comment_count, p.bookmark_count,
+                       p.created_at, p.updated_at, p.published_at, p.deleted_at, p.version, p.request_hash,
+                       EXISTS (SELECT 1 FROM community.post_likes pl
+                               WHERE pl.post_id = p.id AND pl.user_id = :viewerId) AS liked_by_me,
+                       true AS bookmarked_by_me,
+                       b.created_at AS bookmarked_at
+                FROM community.post_bookmarks b
+                JOIN community.posts p ON p.id = b.post_id
+                WHERE b.user_id = :viewerId
+                AND p.status = 'published' AND p.visibility = 'public' AND p.deleted_at IS NULL
+                """;
+        if (after != null) {
+            sql += " AND (b.created_at, b.post_id) < (:cursorBookmarkedAt, :cursorPostId)";
+        }
+        sql += " ORDER BY b.created_at DESC, b.post_id DESC LIMIT :limit";
+        var spec = jdbcClient.sql(sql)
+                .param("viewerId", userId)
+                .param("limit", limitPlusOne);
+        if (after != null) {
+            spec = spec.param("cursorBookmarkedAt", after.bookmarkedAt())
+                    .param("cursorPostId", after.postId());
+        }
+        return spec.query((rs, rowNum) -> new BookmarkedPostRow(
+                mapPost(rs, rowNum),
+                rs.getObject("bookmarked_at", OffsetDateTime.class))).list();
+    }
+
+    public void insertMedia(UUID postId, int position, UUID assetId, boolean isCover, String caption) {
+        jdbcClient.sql("""
+                        INSERT INTO community.post_media (post_id, position, asset_id, is_cover, caption)
+                        VALUES (:postId, :position, :assetId, :isCover, :caption)
+                        """)
+                .param("postId", postId)
+                .param("position", position)
+                .param("assetId", assetId)
+                .param("isCover", isCover)
+                .param("caption", caption)
+                .update();
+    }
+
+    /** Whole-set replacement (PATCH media 整组替换): clear, then re-insert. */
+    public void deleteMedia(UUID postId) {
+        jdbcClient.sql("DELETE FROM community.post_media WHERE post_id = :postId")
+                .param("postId", postId)
+                .update();
+    }
+
+    /**
+     * Media of many posts in one query (position order within each post),
+     * joined with media.assets for the response-side url/dimension fields.
+     */
+    public List<PostMediaRow> findMediaByPostIds(Collection<UUID> postIds) {
+        if (postIds.isEmpty()) {
+            return List.of();
+        }
+        return jdbcClient.sql("""
+                        SELECT pm.post_id, pm.position, pm.asset_id, pm.is_cover, pm.caption,
+                               a.bucket, a.object_key, a.width_px, a.height_px
+                        FROM community.post_media pm
+                        JOIN media.assets a ON a.id = pm.asset_id
+                        WHERE pm.post_id IN (:postIds)
+                        ORDER BY pm.post_id, pm.position
+                        """)
+                .param("postIds", List.copyOf(postIds))
+                .query((rs, rowNum) -> new PostMediaRow(
+                        rs.getObject("post_id", UUID.class),
+                        rs.getInt("position"),
+                        rs.getObject("asset_id", UUID.class),
+                        rs.getBoolean("is_cover"),
+                        rs.getString("caption"),
+                        rs.getString("bucket"),
+                        rs.getString("object_key"),
+                        rs.getObject("width_px", Integer.class),
+                        rs.getObject("height_px", Integer.class)))
+                .list();
+    }
+
+    private static PostRow mapPost(ResultSet rs, int rowNum) throws SQLException {
+        return new PostRow(
+                rs.getObject("id", UUID.class),
+                rs.getObject("author_user_id", UUID.class),
+                rs.getObject("pet_id", UUID.class),
+                rs.getString("category"),
+                rs.getString("title"),
+                rs.getString("content"),
+                rs.getString("status"),
+                rs.getString("visibility"),
+                rs.getLong("like_count"),
+                rs.getLong("comment_count"),
+                rs.getLong("bookmark_count"),
+                rs.getBoolean("liked_by_me"),
+                rs.getBoolean("bookmarked_by_me"),
+                rs.getObject("created_at", OffsetDateTime.class),
+                rs.getObject("updated_at", OffsetDateTime.class),
+                rs.getObject("published_at", OffsetDateTime.class),
+                rs.getObject("deleted_at", OffsetDateTime.class),
+                rs.getInt("version"),
+                rs.getBytes("request_hash"));
+    }
+
+    /** Full projection of one post as seen by a given viewer. */
+    public record PostRow(
+            UUID id,
+            UUID authorUserId,
+            UUID petId,
+            String category,
+            String title,
+            String content,
+            String status,
+            String visibility,
+            long likeCount,
+            long commentCount,
+            long bookmarkCount,
+            boolean likedByMe,
+            boolean bookmarkedByMe,
+            OffsetDateTime createdAt,
+            OffsetDateTime updatedAt,
+            OffsetDateTime publishedAt,
+            OffsetDateTime deletedAt,
+            int version,
+            byte[] requestHash) {
+    }
+
+    /** Row image under FOR UPDATE, the merge base of a PATCH. */
+    public record LockedPost(
+            UUID id,
+            UUID authorUserId,
+            UUID petId,
+            String category,
+            String title,
+            String content,
+            String status,
+            OffsetDateTime publishedAt,
+            int version) {
+    }
+
+    /** One post_media row joined with its asset's storage location. */
+    public record PostMediaRow(
+            UUID postId,
+            int position,
+            UUID assetId,
+            boolean isCover,
+            String caption,
+            String bucket,
+            String objectKey,
+            Integer widthPx,
+            Integer heightPx) {
+    }
+
+    /** A bookmarked post plus the relation row's timestamp (the page key). */
+    public record BookmarkedPostRow(PostRow post, OffsetDateTime bookmarkedAt) {
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/security/BearerAuthFilter.java

@@ -0,0 +1,77 @@
+package com.patbond.patbond.community.security;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+import com.patbond.patbond.common.response.ApiResponse;
+import io.jsonwebtoken.Claims;
+import jakarta.servlet.FilterChain;
+import jakarta.servlet.ServletException;
+import jakarta.servlet.http.HttpServletRequest;
+import jakarta.servlet.http.HttpServletResponse;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.MediaType;
+import org.springframework.web.filter.OncePerRequestFilter;
+
+import java.io.IOException;
+import java.util.UUID;
+
+/**
+ * Bearer authentication for /api/v1/** community endpoints. Verifies the
+ * RS256 signature locally with the auth service's public key and exposes the
+ * authenticated user id as a request attribute. Missing, forged or expired
+ * tokens all answer 401/40101 without detail. Third copy of the user/pet
+ * filter — sinking the shared pure-Java parts into patbond-common stays a
+ * separate decision (iteration-3/02 P9, not ratified in ADR-016~021).
+ */
+public class BearerAuthFilter extends OncePerRequestFilter {
+
+    /** Request attribute holding the authenticated user's UUID. */
+    public static final String USER_ID_ATTRIBUTE = "patbond.authenticatedUserId";
+
+    private static final Logger log = LoggerFactory.getLogger(BearerAuthFilter.class);
+
+    private final JwtVerifier jwtVerifier;
+    private final ObjectMapper objectMapper;
+
+    public BearerAuthFilter(JwtVerifier jwtVerifier, ObjectMapper objectMapper) {
+        this.jwtVerifier = jwtVerifier;
+        this.objectMapper = objectMapper;
+    }
+
+    @Override
+    protected boolean shouldNotFilter(HttpServletRequest request) {
+        return !request.getRequestURI().startsWith("/api/v1/");
+    }
+
+    @Override
+    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response,
+                                    FilterChain filterChain) throws ServletException, IOException {
+        String header = request.getHeader("Authorization");
+        if (header == null || !header.startsWith("Bearer ")) {
+            reject(response, ErrorCode.TOKEN_INVALID);
+            return;
+        }
+        try {
+            Claims claims = jwtVerifier.verify(header.substring("Bearer ".length()).trim());
+            request.setAttribute(USER_ID_ATTRIBUTE, UUID.fromString(claims.getSubject()));
+        } catch (BusinessException e) {
+            reject(response, ErrorCode.TOKEN_INVALID);
+            return;
+        } catch (IllegalStateException | IllegalArgumentException e) {
+            log.error("Access token verification unavailable: {}", e.getMessage());
+            reject(response, ErrorCode.INTERNAL_ERROR);
+            return;
+        }
+        filterChain.doFilter(request, response);
+    }
+
+    private void reject(HttpServletResponse response, ErrorCode errorCode) throws IOException {
+        response.setStatus(errorCode.getHttpStatus());
+        response.setContentType(MediaType.APPLICATION_JSON_VALUE);
+        response.setCharacterEncoding("UTF-8");
+        objectMapper.writeValue(response.getWriter(),
+                ApiResponse.failure(errorCode.getCode(), errorCode.getDefaultMessage()));
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/security/JwtVerifier.java

@@ -0,0 +1,41 @@
+package com.patbond.patbond.community.security;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+import io.jsonwebtoken.Claims;
+import io.jsonwebtoken.JwtException;
+import io.jsonwebtoken.JwtParser;
+import io.jsonwebtoken.Jwts;
+
+/**
+ * Verifies RS256 access tokens issued by patbond-auth against the configured
+ * public key. The key is optional at startup so contexts that never serve
+ * protected routes (most tests) can boot without one; any verification
+ * attempt without a key fails loudly as a server misconfiguration instead of
+ * being reported to the client as an authentication problem.
+ */
+public class JwtVerifier {
+
+    private final JwtParser parser;
+
+    public JwtVerifier(String publicKeyLocation) {
+        this.parser = publicKeyLocation == null || publicKeyLocation.isBlank()
+                ? null
+                : Jwts.parser().verifyWith(RsaPublicKeyLoader.load(publicKeyLocation)).build();
+    }
+
+    /**
+     * @return the verified claims
+     * @throws BusinessException 40101 when the token is forged, malformed or expired
+     */
+    public Claims verify(String token) {
+        if (parser == null) {
+            throw new IllegalStateException("patbond.jwt.public-key 未配置，无法校验 access token");
+        }
+        try {
+            return parser.parseSignedClaims(token).getPayload();
+        } catch (JwtException | IllegalArgumentException e) {
+            throw new BusinessException(ErrorCode.TOKEN_INVALID);
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/security/RsaPublicKeyLoader.java

@@ -0,0 +1,43 @@
+package com.patbond.patbond.community.security;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.security.KeyFactory;
+import java.security.NoSuchAlgorithmException;
+import java.security.PublicKey;
+import java.security.spec.InvalidKeySpecException;
+import java.security.spec.X509EncodedKeySpec;
+import java.util.Base64;
+
+/**
+ * Loads an RSA public key for JWT signature verification. Accepts either
+ * inline PEM or a filesystem path; the inline form (environment variable
+ * PATBOND_JWT_PUBLIC_KEY starting with -----BEGIN) is production's choice
+ * because mounted secrets beat files-in-the-image.
+ */
+public final class RsaPublicKeyLoader {
+
+    private RsaPublicKeyLoader() {
+    }
+
+    public static PublicKey load(String pemOrPath) {
+        String pem = pemOrPath.startsWith("-----BEGIN") ? pemOrPath : readFile(pemOrPath);
+        String stripped = pem.replaceAll("-----BEGIN PUBLIC KEY-----|-----END PUBLIC KEY-----", "")
+                .replaceAll("\\s", "");
+        byte[] decoded = Base64.getDecoder().decode(stripped);
+        try {
+            return KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
+        } catch (NoSuchAlgorithmException | InvalidKeySpecException e) {
+            throw new IllegalArgumentException("Invalid RSA public key", e);
+        }
+    }
+
+    private static String readFile(String path) {
+        try {
+            return Files.readString(Path.of(path));
+        } catch (IOException e) {
+            throw new IllegalArgumentException("Cannot read public key from " + path, e);
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/service/CommentService.java

@@ -0,0 +1,177 @@
+package com.patbond.patbond.community.service;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+import com.patbond.patbond.community.access.UserExistenceGateway;
+import com.patbond.patbond.community.author.AuthorProfileGateway;
+import com.patbond.patbond.community.dto.AuthorSummaryResponse;
+import com.patbond.patbond.community.dto.CommentResponse;
+import com.patbond.patbond.community.dto.CreateCommentRequest;
+import com.patbond.patbond.community.dto.CursorPage;
+import com.patbond.patbond.community.repository.CommentRepository;
+import com.patbond.patbond.community.repository.CommentRepository.CommentRow;
+import com.patbond.patbond.community.repository.InteractionRepository;
+import com.patbond.patbond.community.support.CommentCursor;
+import com.patbond.patbond.community.support.RequestHashes;
+import com.patbond.patbond.community.support.UuidV7;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+
+/**
+ * Flat comments (T3-07 定型). The semantics fixed here are T3-10 freeze
+ * input:
+ *
+ * <ul>
+ *   <li><b>Interaction surface</b> — comments attach to the PUBLIC face of
+ *       a post only: published and live. A draft (its author included),
+ *       hidden/archived or soft-deleted post answers the byte-identical
+ *       404/40403 on every comment path — 互动域不区分「作者的草稿」.</li>
+ *   <li><b>Idempotent create (ADR-019)</b> — Idempotency-Key mandatory,
+ *       stored as client_request_id next to the normalized request hash;
+ *       same key + same payload returns the first comment (201 again),
+ *       different payload 40905, keys scoped per author. A replay hitting
+ *       a since-deleted first comment answers 404/40404 (T3-04 §2.4
+ *       同一先例).</li>
+ *   <li><b>Delete</b> — the comment's author only（D3-7 拍板：帖主删他人
+ *       评论首版不做）; a non-author on a visible comment gets 403/40301,
+ *       everything invisible (absent, deleted, its post invisible) merges
+ *       into 404/40404. comment_count moves -1 in the same transaction,
+ *       exactly once — the FOR UPDATE lock serializes double deletes.</li>
+ * </ul>
+ */
+@Service
+public class CommentService {
+
+    private final CommentRepository commentRepository;
+    private final InteractionRepository interactionRepository;
+    private final UserExistenceGateway userExistenceGateway;
+    private final AuthorProfileGateway authorProfileGateway;
+
+    public CommentService(CommentRepository commentRepository,
+                          InteractionRepository interactionRepository,
+                          UserExistenceGateway userExistenceGateway,
+                          AuthorProfileGateway authorProfileGateway) {
+        this.commentRepository = commentRepository;
+        this.interactionRepository = interactionRepository;
+        this.userExistenceGateway = userExistenceGateway;
+        this.authorProfileGateway = authorProfileGateway;
+    }
+
+    @Transactional(readOnly = true)
+    public CursorPage<CommentResponse> list(UUID postId, int limit, String cursor) {
+        requireInteractable(postId);
+        CommentCursor after = cursor == null ? null : CommentCursor.decode(cursor);
+        List<CommentRow> rows = commentRepository.pageByPost(postId, after, limit + 1);
+        boolean hasMore = rows.size() > limit;
+        List<CommentRow> page = hasMore ? rows.subList(0, limit) : rows;
+        String nextCursor = hasMore
+                ? new CommentCursor(page.get(limit - 1).createdAt(), page.get(limit - 1).id()).encode()
+                : null;
+        return new CursorPage<>(assemble(page), nextCursor, hasMore);
+    }
+
+    @Transactional
+    public CommentResponse create(UUID userId, UUID postId, String idempotencyKey,
+                                  CreateCommentRequest request) {
+        String key = normalizeIdempotencyKey(idempotencyKey);
+        String content = requireContent(request.getContent());
+        requireInteractable(postId);
+        if (request.getReplyToUserId() != null
+                && !userExistenceGateway.existsActive(request.getReplyToUserId())) {
+            throw new BusinessException(ErrorCode.TARGET_USER_NOT_FOUND);
+        }
+
+        byte[] requestHash = RequestHashes.sha256(
+                canonicalize(postId, content, request.getReplyToUserId()));
+        UUID id = UuidV7.generate();
+        int inserted = commentRepository.insertComment(id, postId, userId,
+                request.getReplyToUserId(), content, key, requestHash);
+        if (inserted == 0) {
+            CommentRow first = commentRepository.findByAuthorAndClientRequestId(userId, key)
+                    .orElseThrow(() -> new BusinessException(ErrorCode.INTERNAL_ERROR));
+            if (!Arrays.equals(first.requestHash(), requestHash)) {
+                throw new BusinessException(ErrorCode.IDEMPOTENCY_PAYLOAD_MISMATCH);
+            }
+            if (first.deletedAt() != null) {
+                throw new BusinessException(ErrorCode.COMMENT_NOT_FOUND);
+            }
+            return assemble(List.of(first)).get(0);
+        }
+        interactionRepository.bumpCommentCount(postId, 1);
+        CommentRow row = commentRepository.lockVisibleById(id)
+                .orElseThrow(() -> new BusinessException(ErrorCode.INTERNAL_ERROR));
+        return assemble(List.of(row)).get(0);
+    }
+
+    @Transactional
+    public void delete(UUID userId, UUID commentId) {
+        CommentRow comment = commentRepository.lockVisibleById(commentId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.COMMENT_NOT_FOUND));
+        if (!interactionRepository.isInteractable(comment.postId())) {
+            throw new BusinessException(ErrorCode.COMMENT_NOT_FOUND);
+        }
+        if (!comment.authorUserId().equals(userId)) {
+            throw new BusinessException(ErrorCode.POST_ACCESS_DENIED);
+        }
+        commentRepository.softDelete(commentId);
+        interactionRepository.bumpCommentCount(comment.postId(), -1);
+    }
+
+    private void requireInteractable(UUID postId) {
+        if (!interactionRepository.isInteractable(postId)) {
+            throw new BusinessException(ErrorCode.POST_NOT_FOUND);
+        }
+    }
+
+    private static String normalizeIdempotencyKey(String idempotencyKey) {
+        String key = idempotencyKey == null ? "" : idempotencyKey.trim();
+        if (key.isEmpty() || key.length() > 128) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR,
+                    "Idempotency-Key 必带且长度须在 1~128 字符");
+        }
+        return key;
+    }
+
+    private static String requireContent(String content) {
+        String trimmed = content == null ? "" : content.trim();
+        if (trimmed.isEmpty() || trimmed.length() > 2000) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "content 长度须在 1~2000 字符");
+        }
+        return trimmed;
+    }
+
+    /** Canonical form fed to the request hash — see {@link RequestHashes}. */
+    private static String canonicalize(UUID postId, String content, UUID replyToUserId) {
+        return "comment.v1\n" + postId + '\n'
+                + (replyToUserId == null ? "" : replyToUserId) + '\n'
+                + content + '\n';
+    }
+
+    private List<CommentResponse> assemble(List<CommentRow> rows) {
+        Set<UUID> userIds = new HashSet<>();
+        for (CommentRow row : rows) {
+            userIds.add(row.authorUserId());
+            if (row.replyToUserId() != null) {
+                userIds.add(row.replyToUserId());
+            }
+        }
+        Map<UUID, AuthorSummaryResponse> profiles = authorProfileGateway.summarize(userIds);
+        return rows.stream().map(row -> new CommentResponse(
+                row.id(),
+                row.postId(),
+                profiles.getOrDefault(row.authorUserId(),
+                        AuthorSummaryResponse.idOnly(row.authorUserId())),
+                row.replyToUserId() == null ? null
+                        : profiles.getOrDefault(row.replyToUserId(),
+                                AuthorSummaryResponse.idOnly(row.replyToUserId())),
+                row.content(),
+                row.createdAt())).toList();
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/service/FeedService.java

@@ -0,0 +1,142 @@
+package com.patbond.patbond.community.service;
+
+import com.patbond.patbond.community.author.AuthorProfileGateway;
+import com.patbond.patbond.community.dto.AuthorSummaryResponse;
+import com.patbond.patbond.community.dto.CursorPage;
+import com.patbond.patbond.community.dto.FeedCardResponse;
+import com.patbond.patbond.community.dto.PostMediaItemResponse;
+import com.patbond.patbond.community.media.MediaUrlSigner;
+import com.patbond.patbond.community.repository.PostRepository;
+import com.patbond.patbond.community.repository.PostRepository.BookmarkedPostRow;
+import com.patbond.patbond.community.repository.PostRepository.PostMediaRow;
+import com.patbond.patbond.community.repository.PostRepository.PostRow;
+import com.patbond.patbond.community.support.BookmarkCursor;
+import com.patbond.patbond.community.support.FeedCursor;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.List;
+import java.util.Map;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+/**
+ * The public feed (T3-05): keyset pagination over the ix_posts_feed key
+ * (published_at DESC, id DESC), cards assembled from the posts row (counts
+ * come from the denormalized like/comment/bookmark_count columns — the
+ * writers of T3-06/T3-07 maintain them in the same transaction as the
+ * relation rows), the cover media item, the viewer's liked/bookmarked flags
+ * and the D3-9 author summary. Everything is batch: one page query, one
+ * media query, at most one profile call — no per-card work.
+ */
+@Service
+public class FeedService {
+
+    /** Frozen preview rule: the first 200 Unicode code points, verbatim. */
+    static final int PREVIEW_CODE_POINTS = 200;
+
+    private final PostRepository postRepository;
+    private final MediaUrlSigner mediaUrlSigner;
+    private final AuthorProfileGateway authorProfileGateway;
+
+    public FeedService(PostRepository postRepository, MediaUrlSigner mediaUrlSigner,
+                       AuthorProfileGateway authorProfileGateway) {
+        this.postRepository = postRepository;
+        this.mediaUrlSigner = mediaUrlSigner;
+        this.authorProfileGateway = authorProfileGateway;
+    }
+
+    @Transactional(readOnly = true)
+    public CursorPage<FeedCardResponse> list(UUID viewerId, int limit, String cursor) {
+        FeedCursor after = cursor == null ? null : FeedCursor.decode(cursor);
+        List<PostRow> rows = postRepository.pageFeed(viewerId, after, limit + 1);
+        boolean hasMore = rows.size() > limit;
+        List<PostRow> page = hasMore ? rows.subList(0, limit) : rows;
+        String nextCursor = hasMore
+                ? new FeedCursor(page.get(limit - 1).publishedAt(), page.get(limit - 1).id()).encode()
+                : null;
+        return new CursorPage<>(assembleCards(page), nextCursor, hasMore);
+    }
+
+    /**
+     * My-bookmarks page (T3-07): the item IS the feed card（草案定型：项
+     * 形态复用 Feed 卡片）, the order and cursor key on the bookmark
+     * relation row, and posts that turned invisible since bookmarking are
+     * silently dropped inside the page query — the same public-face
+     * predicate the feed uses, so a card here never breaks the
+     * publishedAt-non-null invariant.
+     */
+    @Transactional(readOnly = true)
+    public CursorPage<FeedCardResponse> listBookmarked(UUID userId, int limit, String cursor) {
+        BookmarkCursor after = cursor == null ? null : BookmarkCursor.decode(cursor);
+        List<BookmarkedPostRow> rows = postRepository.pageBookmarked(userId, after, limit + 1);
+        boolean hasMore = rows.size() > limit;
+        List<BookmarkedPostRow> page = hasMore ? rows.subList(0, limit) : rows;
+        String nextCursor = hasMore
+                ? new BookmarkCursor(page.get(limit - 1).bookmarkedAt(),
+                        page.get(limit - 1).post().id()).encode()
+                : null;
+        return new CursorPage<>(assembleCards(page.stream().map(BookmarkedPostRow::post).toList()),
+                nextCursor, hasMore);
+    }
+
+    private List<FeedCardResponse> assembleCards(List<PostRow> rows) {
+        Map<UUID, List<PostMediaRow>> mediaByPost = postRepository
+                .findMediaByPostIds(rows.stream().map(PostRow::id).toList())
+                .stream()
+                .collect(Collectors.groupingBy(PostMediaRow::postId));
+        Map<UUID, AuthorSummaryResponse> authors = authorProfileGateway.summarize(
+                rows.stream().map(PostRow::authorUserId).collect(Collectors.toSet()));
+        return rows.stream().map(row -> {
+            List<PostMediaRow> media = mediaByPost.getOrDefault(row.id(), List.of());
+            return new FeedCardResponse(
+                    row.id(),
+                    authors.getOrDefault(row.authorUserId(),
+                            AuthorSummaryResponse.idOnly(row.authorUserId())),
+                    row.category(),
+                    row.title(),
+                    preview(row.content()),
+                    coverOf(media),
+                    media.size(),
+                    row.likeCount(),
+                    row.commentCount(),
+                    row.bookmarkCount(),
+                    row.likedByMe(),
+                    row.bookmarkedByMe(),
+                    row.publishedAt());
+        }).toList();
+    }
+
+    /**
+     * The is_cover row (unique per post, and present whenever media exist —
+     * T3-04 §2.6 sets it on position 0 when the author picked none).
+     */
+    private PostMediaItemResponse coverOf(List<PostMediaRow> media) {
+        return media.stream()
+                .filter(PostMediaRow::isCover)
+                .findFirst()
+                .map(m -> new PostMediaItemResponse(
+                        m.assetId(),
+                        m.position(),
+                        m.isCover(),
+                        mediaUrlSigner.signGet(m.bucket(), m.objectKey()),
+                        m.widthPx(),
+                        m.heightPx(),
+                        m.caption()))
+                .orElse(null);
+    }
+
+    /**
+     * Preview = the first {@value #PREVIEW_CODE_POINTS} code points of the
+     * stored content, cut on a code-point boundary (no surrogate is ever
+     * split), no ellipsis appended — whether the card is a truncation is
+     * the client's call via {@code contentPreview.length} vs its own
+     * rendering, and the full text always comes from the detail endpoint.
+     */
+    static String preview(String content) {
+        if (content.codePointCount(0, content.length()) <= PREVIEW_CODE_POINTS) {
+            return content;
+        }
+        return content.substring(0, content.offsetByCodePoints(0, PREVIEW_CODE_POINTS));
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/service/FollowService.java

@@ -0,0 +1,67 @@
+package com.patbond.patbond.community.service;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+import com.patbond.patbond.community.access.UserExistenceGateway;
+import com.patbond.patbond.community.dto.FollowStateResponse;
+import com.patbond.patbond.community.dto.FollowStatsResponse;
+import com.patbond.patbond.community.repository.InteractionRepository;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.UUID;
+
+/**
+ * The ADR-018 minimal follow surface: follow/unfollow (PUT/DELETE
+ * idempotent on the composite primary key, ADR-019) plus the follow-stats
+ * numbers. Counts are real-time COUNTs — user_follows carries no
+ * denormalized counters, and both directions ride an index. The target
+ * must be an existing active user (404/40406, absent and 注销 merged);
+ * following oneself is 422/42204 on PUT (ck_user_follows_self is the
+ * database backstop), while DELETE stays a plain idempotent no-op — a
+ * self-follow row cannot exist, so the authoritative false is the truth.
+ */
+@Service
+public class FollowService {
+
+    private final InteractionRepository interactionRepository;
+    private final UserExistenceGateway userExistenceGateway;
+
+    public FollowService(InteractionRepository interactionRepository,
+                         UserExistenceGateway userExistenceGateway) {
+        this.interactionRepository = interactionRepository;
+        this.userExistenceGateway = userExistenceGateway;
+    }
+
+    @Transactional
+    public FollowStateResponse follow(UUID userId, UUID targetUserId) {
+        if (userId.equals(targetUserId)) {
+            throw new BusinessException(ErrorCode.FOLLOW_RULE_VIOLATION);
+        }
+        requireActive(targetUserId);
+        interactionRepository.insertFollow(userId, targetUserId);
+        return new FollowStateResponse(true, interactionRepository.countFollowers(targetUserId));
+    }
+
+    @Transactional
+    public FollowStateResponse unfollow(UUID userId, UUID targetUserId) {
+        requireActive(targetUserId);
+        interactionRepository.deleteFollow(userId, targetUserId);
+        return new FollowStateResponse(false, interactionRepository.countFollowers(targetUserId));
+    }
+
+    @Transactional(readOnly = true)
+    public FollowStatsResponse stats(UUID viewerId, UUID targetUserId) {
+        requireActive(targetUserId);
+        return new FollowStatsResponse(
+                interactionRepository.countFollowers(targetUserId),
+                interactionRepository.countFollowing(targetUserId),
+                interactionRepository.followExists(viewerId, targetUserId));
+    }
+
+    private void requireActive(UUID targetUserId) {
+        if (!userExistenceGateway.existsActive(targetUserId)) {
+            throw new BusinessException(ErrorCode.TARGET_USER_NOT_FOUND);
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/service/InteractionService.java

@@ -0,0 +1,78 @@
+package com.patbond.patbond.community.service;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+import com.patbond.patbond.community.dto.BookmarkStateResponse;
+import com.patbond.patbond.community.dto.LikeStateResponse;
+import com.patbond.patbond.community.repository.InteractionRepository;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.util.UUID;
+
+/**
+ * Binary post interactions (T3-06, ADR-019): PUT/DELETE are idempotent by
+ * construction — the relation row's composite primary key is the
+ * idempotency key, the counter column moves in the same transaction and
+ * only by the number of rows the relation write actually changed, so
+ * concurrent duplicates converge (N concurrent PUTs land exactly one row
+ * and exactly +1) and every response carries the authoritative terminal
+ * state. The interaction gate is the post's public face: anything not
+ * published-and-live answers the byte-identical 404/40403 on PUT and
+ * DELETE alike.
+ */
+@Service
+public class InteractionService {
+
+    private final InteractionRepository interactionRepository;
+
+    public InteractionService(InteractionRepository interactionRepository) {
+        this.interactionRepository = interactionRepository;
+    }
+
+    @Transactional
+    public LikeStateResponse like(UUID userId, UUID postId) {
+        requireInteractable(postId);
+        int inserted = interactionRepository.insertLike(postId, userId);
+        long count = inserted > 0
+                ? interactionRepository.bumpLikeCount(postId, inserted)
+                : interactionRepository.likeCount(postId);
+        return new LikeStateResponse(true, count);
+    }
+
+    @Transactional
+    public LikeStateResponse unlike(UUID userId, UUID postId) {
+        requireInteractable(postId);
+        int deleted = interactionRepository.deleteLike(postId, userId);
+        long count = deleted > 0
+                ? interactionRepository.bumpLikeCount(postId, -deleted)
+                : interactionRepository.likeCount(postId);
+        return new LikeStateResponse(false, count);
+    }
+
+    @Transactional
+    public BookmarkStateResponse bookmark(UUID userId, UUID postId) {
+        requireInteractable(postId);
+        int inserted = interactionRepository.insertBookmark(postId, userId);
+        long count = inserted > 0
+                ? interactionRepository.bumpBookmarkCount(postId, inserted)
+                : interactionRepository.bookmarkCount(postId);
+        return new BookmarkStateResponse(true, count);
+    }
+
+    @Transactional
+    public BookmarkStateResponse unbookmark(UUID userId, UUID postId) {
+        requireInteractable(postId);
+        int deleted = interactionRepository.deleteBookmark(postId, userId);
+        long count = deleted > 0
+                ? interactionRepository.bumpBookmarkCount(postId, -deleted)
+                : interactionRepository.bookmarkCount(postId);
+        return new BookmarkStateResponse(false, count);
+    }
+
+    private void requireInteractable(UUID postId) {
+        if (!interactionRepository.isInteractable(postId)) {
+            throw new BusinessException(ErrorCode.POST_NOT_FOUND);
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/service/PostService.java

@@ -0,0 +1,435 @@
+package com.patbond.patbond.community.service;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+import com.patbond.patbond.community.access.PetVisibilityGateway;
+import com.patbond.patbond.community.author.AuthorProfileGateway;
+import com.patbond.patbond.community.dto.AuthorSummaryResponse;
+import com.patbond.patbond.community.dto.CommunityStatsResponse;
+import com.patbond.patbond.community.dto.CreatePostRequest;
+import com.patbond.patbond.community.dto.CursorPage;
+import com.patbond.patbond.community.dto.PostMediaAttachRequest;
+import com.patbond.patbond.community.dto.PostMediaItemResponse;
+import com.patbond.patbond.community.dto.PostResponse;
+import com.patbond.patbond.community.dto.UpdatePostRequest;
+import com.patbond.patbond.community.media.MediaAssetGateway;
+import com.patbond.patbond.community.media.MediaAssetRef;
+import com.patbond.patbond.community.media.MediaUrlSigner;
+import com.patbond.patbond.community.repository.PostRepository;
+import com.patbond.patbond.community.repository.PostRepository.LockedPost;
+import com.patbond.patbond.community.repository.PostRepository.PostMediaRow;
+import com.patbond.patbond.community.repository.PostRepository.PostRow;
+import com.patbond.patbond.community.support.PostCursor;
+import com.patbond.patbond.community.support.RequestHashes;
+import com.patbond.patbond.community.support.UuidV7;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+import java.time.OffsetDateTime;
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.HashSet;
+import java.util.List;
+import java.util.Map;
+import java.util.Set;
+import java.util.UUID;
+import java.util.stream.Collectors;
+
+/**
+ * Post lifecycle use-cases (T3-04): draft/edit/publish/soft-delete/detail/
+ * my-posts. The permission and error semantics implemented here are the
+ * T3-10 freeze input:
+ *
+ * <ul>
+ *   <li><b>Visibility</b> — published is visible to every authenticated
+ *       user; draft only to its author; hidden/archived (operational
+ *       states, D3-7) and soft-deleted answer 404/40403 to EVERYONE, the
+ *       author included. Every invisible case is byte-identical
+ *       (anti-enumeration).</li>
+ *   <li><b>403 vs 404</b> — 403/40301 goes only to callers the post is
+ *       VISIBLE to (non-author PATCH/DELETE of a published post); anything
+ *       invisible is 404/40403, never 403.</li>
+ *   <li><b>Idempotent create (ADR-019)</b> — Idempotency-Key mandatory;
+ *       same key + same normalized payload returns the first write (201
+ *       again), same key + different payload answers 409/40905, keys are
+ *       scoped per author (two users may reuse a key).</li>
+ *   <li><b>Publish</b> — a PATCH carrying {@code status: published}; the
+ *       only open transition is draft→published (publishedAt written once);
+ *       re-publishing a published post is a no-op. published→draft does not
+ *       exist (the request enum rejects it as 40000).</li>
+ * </ul>
+ */
+@Service
+public class PostService {
+
+    private static final int MAX_MEDIA = 9;
+
+    private final PostRepository postRepository;
+    private final MediaAssetGateway mediaAssetGateway;
+    private final MediaUrlSigner mediaUrlSigner;
+    private final PetVisibilityGateway petVisibilityGateway;
+    private final AuthorProfileGateway authorProfileGateway;
+
+    public PostService(PostRepository postRepository, MediaAssetGateway mediaAssetGateway,
+                       MediaUrlSigner mediaUrlSigner, PetVisibilityGateway petVisibilityGateway,
+                       AuthorProfileGateway authorProfileGateway) {
+        this.postRepository = postRepository;
+        this.mediaAssetGateway = mediaAssetGateway;
+        this.mediaUrlSigner = mediaUrlSigner;
+        this.petVisibilityGateway = petVisibilityGateway;
+        this.authorProfileGateway = authorProfileGateway;
+    }
+
+    @Transactional
+    public PostResponse create(UUID userId, String idempotencyKey, CreatePostRequest request) {
+        String key = normalizeIdempotencyKey(idempotencyKey);
+        String title = requireTitleOrNull(request.getTitle());
+        String content = requireContent(request.getContent());
+        String category = request.getCategory() == null ? "general" : request.getCategory();
+        String status = request.getStatus() == null ? "draft" : request.getStatus();
+        List<NormalizedMedia> media = normalizeMedia(request.getMedia());
+
+        if (request.getPetId() != null) {
+            petVisibilityGateway.requireVisible(userId, request.getPetId());
+        }
+        validateAssets(userId, media);
+
+        byte[] requestHash = RequestHashes.sha256(
+                canonicalize(category, status, title, content, request.getPetId(), media));
+
+        UUID id = UuidV7.generate();
+        OffsetDateTime publishedAt = "published".equals(status) ? OffsetDateTime.now() : null;
+        int inserted = postRepository.insertPost(id, userId, request.getPetId(), category, title,
+                content, status, publishedAt, key, requestHash);
+        if (inserted == 0) {
+            // The author used this key before (or a concurrent retry won the
+            // race): settle retry-vs-mismatch on the stored request_hash.
+            PostRow first = postRepository.findByAuthorAndIdempotencyKey(userId, key, userId)
+                    .orElseThrow(() -> new BusinessException(ErrorCode.INTERNAL_ERROR));
+            if (!Arrays.equals(first.requestHash(), requestHash)) {
+                throw new BusinessException(ErrorCode.IDEMPOTENCY_PAYLOAD_MISMATCH);
+            }
+            if (first.deletedAt() != null) {
+                // The first write was deleted meanwhile — the resource the
+                // retry asks about is gone, same anti-enumeration 404.
+                throw new BusinessException(ErrorCode.POST_NOT_FOUND);
+            }
+            return assembleOne(first);
+        }
+        for (NormalizedMedia item : media) {
+            postRepository.insertMedia(id, item.position(), item.assetId(), item.isCover(),
+                    item.caption());
+        }
+        PostRow row = postRepository.findLiveById(id, userId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.INTERNAL_ERROR));
+        return assembleOne(row);
+    }
+
+    @Transactional(readOnly = true)
+    public PostResponse get(UUID userId, UUID postId) {
+        PostRow row = postRepository.findLiveById(postId, userId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.POST_NOT_FOUND));
+        if (!visibleTo(row.status(), row.authorUserId(), userId)) {
+            throw new BusinessException(ErrorCode.POST_NOT_FOUND);
+        }
+        return assembleOne(row);
+    }
+
+    @Transactional
+    public PostResponse update(UUID userId, UUID postId, UpdatePostRequest request) {
+        LockedPost current = requireAuthorEditable(userId, postId);
+        if (request.getVersion() != current.version()) {
+            throw new BusinessException(ErrorCode.VERSION_CONFLICT);
+        }
+
+        String title = request.getTitle() != null
+                ? requireTitleOrNull(request.getTitle())
+                : current.title();
+        String content = request.getContent() != null
+                ? requireContent(request.getContent())
+                : current.content();
+        String category = request.getCategory() != null ? request.getCategory() : current.category();
+        UUID petId = current.petId();
+        if (request.getPetId() != null) {
+            petVisibilityGateway.requireVisible(userId, request.getPetId());
+            petId = request.getPetId();
+        }
+
+        String status = current.status();
+        OffsetDateTime publishedAt = current.publishedAt();
+        if ("published".equals(request.getStatus()) && "draft".equals(current.status())) {
+            // The single open transition: draft→published, publishedAt
+            // written exactly once (ck_posts_publish_state). Publishing an
+            // already-published post falls through as a no-op.
+            status = "published";
+            publishedAt = OffsetDateTime.now();
+        }
+
+        if (request.getMedia() != null) {
+            List<NormalizedMedia> media = normalizeMedia(request.getMedia());
+            validateAssets(userId, media);
+            postRepository.deleteMedia(postId);
+            for (NormalizedMedia item : media) {
+                postRepository.insertMedia(postId, item.position(), item.assetId(), item.isCover(),
+                        item.caption());
+            }
+        }
+
+        int updated = postRepository.updatePost(postId, request.getVersion(), petId, category,
+                title, content, status, publishedAt);
+        if (updated == 0) {
+            throw new BusinessException(ErrorCode.VERSION_CONFLICT);
+        }
+        PostRow row = postRepository.findLiveById(postId, userId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.INTERNAL_ERROR));
+        return assembleOne(row);
+    }
+
+    @Transactional
+    public void delete(UUID userId, UUID postId) {
+        requireAuthorEditable(userId, postId);
+        postRepository.softDelete(postId);
+    }
+
+    @Transactional(readOnly = true)
+    public CursorPage<PostResponse> listMine(UUID userId, String status, int limit, String cursor) {
+        if (status != null && !status.equals("draft") && !status.equals("published")) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "status 仅支持 draft/published");
+        }
+        PostCursor after = cursor == null ? null : PostCursor.decode(cursor);
+        List<PostRow> rows = postRepository.pageByAuthor(userId, status, after, limit + 1);
+        boolean hasMore = rows.size() > limit;
+        List<PostRow> page = hasMore ? rows.subList(0, limit) : rows;
+        String nextCursor = hasMore
+                ? new PostCursor(page.get(limit - 1).createdAt(), page.get(limit - 1).id()).encode()
+                : null;
+        return new CursorPage<>(assemble(page), nextCursor, hasMore);
+    }
+
+    /**
+     * The caller's own community numbers (T3.5-06): total likes received on
+     * published, live posts plus the count of those posts. Aggregated on read
+     * (ADR-022) — the write side keeps no per-user counter, so there is
+     * nothing that can drift out of sync. Empty data is a legitimate answer of
+     * zeros, never a 404: every authenticated user has stats, even a brand-new
+     * one with nothing published.
+     */
+    @Transactional(readOnly = true)
+    public CommunityStatsResponse communityStats(UUID userId) {
+        return postRepository.aggregateByAuthor(userId);
+    }
+
+    /**
+     * The shared write gate of PATCH/DELETE: locks the live row, then walks
+     * the 403/404 boundary — invisible (absent, deleted, hidden/archived,
+     * someone else's draft) → 40403; visible but not the author's
+     * (published, someone else's) → 40301.
+     */
+    private LockedPost requireAuthorEditable(UUID userId, UUID postId) {
+        LockedPost current = postRepository.lockLiveById(postId)
+                .orElseThrow(() -> new BusinessException(ErrorCode.POST_NOT_FOUND));
+        boolean visible = visibleTo(current.status(), current.authorUserId(), userId);
+        if (!visible) {
+            throw new BusinessException(ErrorCode.POST_NOT_FOUND);
+        }
+        if (!current.authorUserId().equals(userId)) {
+            throw new BusinessException(ErrorCode.POST_ACCESS_DENIED);
+        }
+        return current;
+    }
+
+    /**
+     * The visibility matrix (T3-10 freeze input): published → everyone;
+     * draft → author only; hidden/archived → no one, the author included
+     * (no operational state leaks through the M3 contract, whose status
+     * enum stays [draft, published]).
+     */
+    private static boolean visibleTo(String status, UUID authorUserId, UUID viewerId) {
+        return switch (status) {
+            case "published" -> true;
+            case "draft" -> authorUserId.equals(viewerId);
+            default -> false;
+        };
+    }
+
+    // ---------- create-side normalization ----------
+
+    private static String normalizeIdempotencyKey(String idempotencyKey) {
+        String key = idempotencyKey == null ? "" : idempotencyKey.trim();
+        if (key.isEmpty() || key.length() > 128) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR,
+                    "Idempotency-Key 必带且长度须在 1~128 字符");
+        }
+        return key;
+    }
+
+    /**
+     * A provided title must survive trimming (ck_posts_title width) — a
+     * whitespace-only title is a 40000, NOT a clear-to-null: PATCH does not
+     * support clearing optional fields back to null (M2 惯例), and create
+     * stays symmetric.
+     */
+    private static String requireTitleOrNull(String title) {
+        if (title == null) {
+            return null;
+        }
+        String trimmed = title.trim();
+        if (trimmed.isEmpty() || trimmed.length() > 120) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "title 长度须在 1~120 字符");
+        }
+        return trimmed;
+    }
+
+    private static String requireContent(String content) {
+        String trimmed = content == null ? "" : content.trim();
+        if (trimmed.isEmpty() || trimmed.length() > 10000) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "content 长度须在 1~10000 字符");
+        }
+        return trimmed;
+    }
+
+    /**
+     * Resolves positions and the cover flag: either every item names a
+     * position (together exactly 0..n-1) or none does (array order); at
+     * most one isCover=true (uq_post_media_cover), none → position 0 gets
+     * the flag (草案预设：全 false 服务端取 position 0).
+     */
+    private static List<NormalizedMedia> normalizeMedia(List<PostMediaAttachRequest> requested) {
+        if (requested == null || requested.isEmpty()) {
+            return List.of();
+        }
+        long withPosition = requested.stream().filter(m -> m.getPosition() != null).count();
+        if (withPosition != 0 && withPosition != requested.size()) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR,
+                    "media position 须全部提供或全部省略");
+        }
+        long covers = requested.stream().filter(m -> Boolean.TRUE.equals(m.getIsCover())).count();
+        if (covers > 1) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "isCover 至多一个");
+        }
+
+        List<NormalizedMedia> items = new ArrayList<>(requested.size());
+        Set<Integer> seenPositions = new HashSet<>();
+        Set<UUID> seenAssets = new HashSet<>();
+        for (int i = 0; i < requested.size(); i++) {
+            PostMediaAttachRequest m = requested.get(i);
+            int position = m.getPosition() != null ? m.getPosition() : i;
+            if (!seenPositions.add(position) || position >= requested.size()) {
+                throw new BusinessException(ErrorCode.VALIDATION_ERROR,
+                        "media position 须为 0 起连续且不重复");
+            }
+            if (!seenAssets.add(m.getAssetId())) {
+                throw new BusinessException(ErrorCode.VALIDATION_ERROR, "media 中 assetId 重复");
+            }
+            items.add(new NormalizedMedia(m.getAssetId(), position,
+                    Boolean.TRUE.equals(m.getIsCover()), trimOrNull(m.getCaption())));
+        }
+        items.sort((a, b) -> Integer.compare(a.position(), b.position()));
+        if (covers == 0) {
+            items.set(0, items.get(0).asCover());
+        }
+        if (items.size() > MAX_MEDIA) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "media 最多 9 张图");
+        }
+        return items;
+    }
+
+    /**
+     * The T3-03 联调协议 on the referencing side: an asset that does not
+     * exist, is not the caller's or is deleted answers 404/40405 (one merged
+     * anti-enumeration case); the caller's own asset in uploading/failed
+     * answers 422/42203.
+     */
+    private void validateAssets(UUID userId, List<NormalizedMedia> media) {
+        if (media.isEmpty()) {
+            return;
+        }
+        Map<UUID, MediaAssetRef> assets = mediaAssetGateway.findByIds(
+                media.stream().map(NormalizedMedia::assetId).collect(Collectors.toSet()));
+        for (NormalizedMedia item : media) {
+            MediaAssetRef ref = assets.get(item.assetId());
+            if (ref == null || !userId.equals(ref.ownerUserId()) || "deleted".equals(ref.status())) {
+                throw new BusinessException(ErrorCode.MEDIA_NOT_FOUND);
+            }
+            if (!"ready".equals(ref.status())) {
+                throw new BusinessException(ErrorCode.MEDIA_NOT_READY);
+            }
+        }
+    }
+
+    /** Canonical form fed to the request hash — see {@link RequestHashes}. */
+    private static String canonicalize(String category, String status, String title, String content,
+                                       UUID petId, List<NormalizedMedia> media) {
+        StringBuilder sb = new StringBuilder("post.v1\n")
+                .append(category).append('\n')
+                .append(status).append('\n')
+                .append(title == null ? "" : title).append('\n')
+                .append(content).append('\n')
+                .append(petId == null ? "" : petId).append('\n');
+        for (NormalizedMedia item : media) {
+            sb.append(item.assetId()).append(':').append(item.position()).append(':')
+                    .append(item.isCover()).append(':')
+                    .append(item.caption() == null ? "" : item.caption()).append('\n');
+        }
+        return sb.toString();
+    }
+
+    private static String trimOrNull(String value) {
+        if (value == null) {
+            return null;
+        }
+        String trimmed = value.trim();
+        return trimmed.isEmpty() ? null : trimmed;
+    }
+
+    // ---------- response assembly ----------
+
+    private PostResponse assembleOne(PostRow row) {
+        return assemble(List.of(row)).get(0);
+    }
+
+    private List<PostResponse> assemble(List<PostRow> rows) {
+        Map<UUID, List<PostMediaRow>> mediaByPost = postRepository
+                .findMediaByPostIds(rows.stream().map(PostRow::id).toList())
+                .stream()
+                .collect(Collectors.groupingBy(PostMediaRow::postId));
+        Map<UUID, AuthorSummaryResponse> authors = authorProfileGateway.summarize(
+                rows.stream().map(PostRow::authorUserId).collect(Collectors.toSet()));
+        return rows.stream().map(row -> new PostResponse(
+                row.id(),
+                authors.getOrDefault(row.authorUserId(),
+                        AuthorSummaryResponse.idOnly(row.authorUserId())),
+                row.petId(),
+                row.category(),
+                row.title(),
+                row.content(),
+                row.status(),
+                row.visibility(),
+                mediaByPost.getOrDefault(row.id(), List.of()).stream()
+                        .map(m -> new PostMediaItemResponse(
+                                m.assetId(),
+                                m.position(),
+                                m.isCover(),
+                                mediaUrlSigner.signGet(m.bucket(), m.objectKey()),
+                                m.widthPx(),
+                                m.heightPx(),
+                                m.caption()))
+                        .toList(),
+                row.likeCount(),
+                row.commentCount(),
+                row.bookmarkCount(),
+                row.likedByMe(),
+                row.bookmarkedByMe(),
+                row.createdAt(),
+                row.updatedAt(),
+                row.publishedAt(),
+                row.version())).toList();
+    }
+
+    private record NormalizedMedia(UUID assetId, int position, boolean isCover, String caption) {
+
+        NormalizedMedia asCover() {
+            return new NormalizedMedia(assetId, position, true, caption);
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/support/BookmarkCursor.java

@@ -0,0 +1,46 @@
+package com.patbond.patbond.community.support;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+
+import java.nio.charset.StandardCharsets;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.util.Base64;
+import java.util.UUID;
+
+/**
+ * Opaque cursor of the my-bookmarks list (bookmarks.created_at DESC,
+ * post_id DESC — the exact key of ix_post_bookmarks_user_created). The key
+ * lives on the RELATION row, not the post: a bookmarked post that later
+ * turns invisible is filtered inside the same keyset query, so pages stay
+ * complete and the cursor never points at a value the client saw filtered.
+ * Encoding is the shared base64url("epochMicros:id") shape.
+ */
+public record BookmarkCursor(OffsetDateTime bookmarkedAt, UUID postId) {
+
+    public String encode() {
+        long micros = Math.multiplyExact(bookmarkedAt.toInstant().getEpochSecond(), 1_000_000L)
+                + bookmarkedAt.getNano() / 1_000L;
+        return Base64.getUrlEncoder().withoutPadding()
+                .encodeToString((micros + ":" + postId).getBytes(StandardCharsets.UTF_8));
+    }
+
+    /** @throws BusinessException 40000 when the cursor is not one we issued */
+    public static BookmarkCursor decode(String cursor) {
+        try {
+            String raw = new String(Base64.getUrlDecoder().decode(cursor), StandardCharsets.UTF_8);
+            int sep = raw.indexOf(':');
+            long micros = Long.parseLong(raw.substring(0, sep));
+            UUID postId = UUID.fromString(raw.substring(sep + 1));
+            OffsetDateTime bookmarkedAt = Instant.ofEpochSecond(
+                            Math.floorDiv(micros, 1_000_000L),
+                            Math.floorMod(micros, 1_000_000L) * 1_000L)
+                    .atOffset(ZoneOffset.UTC);
+            return new BookmarkCursor(bookmarkedAt, postId);
+        } catch (RuntimeException e) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "cursor 无效");
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/support/CommentCursor.java

@@ -0,0 +1,45 @@
+package com.patbond.patbond.community.support;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+
+import java.nio.charset.StandardCharsets;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.util.Base64;
+import java.util.UUID;
+
+/**
+ * Opaque cursor of a post's comment list (created_at DESC, id DESC — the
+ * exact key of ix_comments_post_created), same encoding as
+ * {@link PostCursor}: base64url("epochMicros:id"), next page selects
+ * {@code (created_at, id) < (cursor)} so ties on created_at are broken by
+ * id and rows are neither lost nor repeated across page boundaries.
+ */
+public record CommentCursor(OffsetDateTime createdAt, UUID id) {
+
+    public String encode() {
+        long micros = Math.multiplyExact(createdAt.toInstant().getEpochSecond(), 1_000_000L)
+                + createdAt.getNano() / 1_000L;
+        return Base64.getUrlEncoder().withoutPadding()
+                .encodeToString((micros + ":" + id).getBytes(StandardCharsets.UTF_8));
+    }
+
+    /** @throws BusinessException 40000 when the cursor is not one we issued */
+    public static CommentCursor decode(String cursor) {
+        try {
+            String raw = new String(Base64.getUrlDecoder().decode(cursor), StandardCharsets.UTF_8);
+            int sep = raw.indexOf(':');
+            long micros = Long.parseLong(raw.substring(0, sep));
+            UUID id = UUID.fromString(raw.substring(sep + 1));
+            OffsetDateTime createdAt = Instant.ofEpochSecond(
+                            Math.floorDiv(micros, 1_000_000L),
+                            Math.floorMod(micros, 1_000_000L) * 1_000L)
+                    .atOffset(ZoneOffset.UTC);
+            return new CommentCursor(createdAt, id);
+        } catch (RuntimeException e) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "cursor 无效");
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/support/FeedCursor.java

@@ -0,0 +1,46 @@
+package com.patbond.patbond.community.support;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+
+import java.nio.charset.StandardCharsets;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.util.Base64;
+import java.util.UUID;
+
+/**
+ * Opaque cursor of the public feed (published_at DESC, id DESC — the exact
+ * key of ix_posts_feed), same encoding as {@link PostCursor}:
+ * base64url("epochMicros:id"), next page selects
+ * {@code (published_at, id) < (cursor)} so ties on published_at are broken
+ * by id and rows are neither lost nor repeated across page boundaries.
+ * timestamptz carries microseconds, so the micros encoding is lossless.
+ */
+public record FeedCursor(OffsetDateTime publishedAt, UUID id) {
+
+    public String encode() {
+        long micros = Math.multiplyExact(publishedAt.toInstant().getEpochSecond(), 1_000_000L)
+                + publishedAt.getNano() / 1_000L;
+        return Base64.getUrlEncoder().withoutPadding()
+                .encodeToString((micros + ":" + id).getBytes(StandardCharsets.UTF_8));
+    }
+
+    /** @throws BusinessException 40000 when the cursor is not one we issued */
+    public static FeedCursor decode(String cursor) {
+        try {
+            String raw = new String(Base64.getUrlDecoder().decode(cursor), StandardCharsets.UTF_8);
+            int sep = raw.indexOf(':');
+            long micros = Long.parseLong(raw.substring(0, sep));
+            UUID id = UUID.fromString(raw.substring(sep + 1));
+            OffsetDateTime publishedAt = Instant.ofEpochSecond(
+                            Math.floorDiv(micros, 1_000_000L),
+                            Math.floorMod(micros, 1_000_000L) * 1_000L)
+                    .atOffset(ZoneOffset.UTC);
+            return new FeedCursor(publishedAt, id);
+        } catch (RuntimeException e) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "cursor 无效");
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/support/PostCursor.java

@@ -0,0 +1,45 @@
+package com.patbond.patbond.community.support;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+
+import java.nio.charset.StandardCharsets;
+import java.time.Instant;
+import java.time.OffsetDateTime;
+import java.time.ZoneOffset;
+import java.util.Base64;
+import java.util.UUID;
+
+/**
+ * Opaque cursor for the my-posts list (created_at DESC, id DESC — the exact
+ * key of ix_posts_author_created), isomorphic to patbond-pet's EventCursor:
+ * base64url("epochMicros:id"), next page selects
+ * {@code (created_at, id) < (cursor)} so ties on created_at are broken by id
+ * and rows are neither lost nor repeated across page boundaries.
+ */
+public record PostCursor(OffsetDateTime createdAt, UUID id) {
+
+    public String encode() {
+        long micros = Math.multiplyExact(createdAt.toInstant().getEpochSecond(), 1_000_000L)
+                + createdAt.getNano() / 1_000L;
+        return Base64.getUrlEncoder().withoutPadding()
+                .encodeToString((micros + ":" + id).getBytes(StandardCharsets.UTF_8));
+    }
+
+    /** @throws BusinessException 40000 when the cursor is not one we issued */
+    public static PostCursor decode(String cursor) {
+        try {
+            String raw = new String(Base64.getUrlDecoder().decode(cursor), StandardCharsets.UTF_8);
+            int sep = raw.indexOf(':');
+            long micros = Long.parseLong(raw.substring(0, sep));
+            UUID id = UUID.fromString(raw.substring(sep + 1));
+            OffsetDateTime createdAt = Instant.ofEpochSecond(
+                            Math.floorDiv(micros, 1_000_000L),
+                            Math.floorMod(micros, 1_000_000L) * 1_000L)
+                    .atOffset(ZoneOffset.UTC);
+            return new PostCursor(createdAt, id);
+        } catch (RuntimeException e) {
+            throw new BusinessException(ErrorCode.VALIDATION_ERROR, "cursor 无效");
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/support/RequestHashes.java

@@ -0,0 +1,30 @@
+package com.patbond.patbond.community.support;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+
+/**
+ * SHA-256 of the canonical form of a create request (ADR-019: creation-type
+ * writes carry a mandatory Idempotency-Key and the request body's hash is
+ * stored next to it — a keyed retry with the same payload returns the first
+ * write, a different payload answers 40905). Hashing the NORMALIZED command
+ * (trimmed fields, defaults applied, media positions resolved) rather than
+ * the raw bytes makes the comparison insensitive to JSON formatting while
+ * still catching every semantic difference. 32 bytes, matching
+ * ck_posts_idempotency's octet_length(request_hash) = 32.
+ */
+public final class RequestHashes {
+
+    private RequestHashes() {
+    }
+
+    public static byte[] sha256(String canonical) {
+        try {
+            return MessageDigest.getInstance("SHA-256")
+                    .digest(canonical.getBytes(StandardCharsets.UTF_8));
+        } catch (NoSuchAlgorithmException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/support/UuidV7.java

@@ -0,0 +1,30 @@
+package com.patbond.patbond.community.support;
+
+import java.security.SecureRandom;
+import java.util.UUID;
+
+/**
+ * Application-side UUIDv7 generator (RFC 9562): 48-bit Unix millisecond
+ * timestamp, version/variant bits, 74 random bits. Time-ordered values keep
+ * B-tree page churn low on uuid primary keys; the database DEFAULT
+ * gen_random_uuid() remains the fallback for rows not inserted through the
+ * application. Third copy after patbond-user/pet — the services deploy
+ * independently and patbond-common stays contract-only.
+ */
+public final class UuidV7 {
+
+    private static final SecureRandom RANDOM = new SecureRandom();
+
+    private UuidV7() {
+    }
+
+    public static UUID generate() {
+        long timestampMs = System.currentTimeMillis();
+        long randA = RANDOM.nextLong() & 0x0FFFL;
+        long randB = RANDOM.nextLong() & 0x3FFFFFFFFFFFFFFFL;
+
+        long msb = (timestampMs << 16) | 0x7000L | randA;
+        long lsb = 0x8000000000000000L | randB;
+        return new UUID(msb, lsb);
+    }
+}

patbond-community/src/main/java/com/patbond/patbond/community/web/GlobalExceptionHandler.java

@@ -0,0 +1,68 @@
+package com.patbond.patbond.community.web;
+
+import com.patbond.patbond.common.error.BusinessException;
+import com.patbond.patbond.common.error.ErrorCode;
+import com.patbond.patbond.common.response.ApiResponse;
+import jakarta.validation.ConstraintViolationException;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.http.ResponseEntity;
+import org.springframework.http.converter.HttpMessageNotReadableException;
+import org.springframework.validation.FieldError;
+import org.springframework.web.bind.MethodArgumentNotValidException;
+import org.springframework.web.bind.MissingRequestHeaderException;
+import org.springframework.web.bind.annotation.ExceptionHandler;
+import org.springframework.web.bind.annotation.RestControllerAdvice;
+import org.springframework.web.method.annotation.HandlerMethodValidationException;
+import org.springframework.web.method.annotation.MethodArgumentTypeMismatchException;
+import org.springframework.web.servlet.resource.NoResourceFoundException;
+
+/**
+ * Single place that turns exceptions into the {code, message, data} envelope
+ * with a matching HTTP status (development-plan 6.1) — same contract as the
+ * user/auth/pet handlers. Unexpected exceptions are logged in full but never
+ * leak internals to the client.
+ */
+@RestControllerAdvice
+public class GlobalExceptionHandler {
+
+    private static final Logger log = LoggerFactory.getLogger(GlobalExceptionHandler.class);
+
+    @ExceptionHandler(BusinessException.class)
+    public ResponseEntity<ApiResponse<Void>> handleBusiness(BusinessException e) {
+        return ResponseEntity.status(e.getHttpStatus())
+                .body(ApiResponse.failure(e.getCode(), e.getMessage()));
+    }
+
+    @ExceptionHandler(MethodArgumentNotValidException.class)
+    public ResponseEntity<ApiResponse<Void>> handleValidation(MethodArgumentNotValidException e) {
+        String message = e.getBindingResult().getFieldErrors().stream()
+                .findFirst()
+                .map(FieldError::getDefaultMessage)
+                .orElse(ErrorCode.VALIDATION_ERROR.getDefaultMessage());
+        return failure(ErrorCode.VALIDATION_ERROR, message);
+    }
+
+    @ExceptionHandler({HttpMessageNotReadableException.class, MethodArgumentTypeMismatchException.class,
+            ConstraintViolationException.class, HandlerMethodValidationException.class,
+            MissingRequestHeaderException.class})
+    public ResponseEntity<ApiResponse<Void>> handleMalformedRequest(Exception e) {
+        return failure(ErrorCode.VALIDATION_ERROR, ErrorCode.VALIDATION_ERROR.getDefaultMessage());
+    }
+
+    @ExceptionHandler(NoResourceFoundException.class)
+    public ResponseEntity<ApiResponse<Void>> handleNoResource(NoResourceFoundException e) {
+        return ResponseEntity.status(404).body(ApiResponse.failure(40400, "资源不存在"));
+    }
+
+    @ExceptionHandler(Exception.class)
+    public ResponseEntity<ApiResponse<Void>> handleUnexpected(Exception e) {
+        log.error("Unhandled exception", e);
+        return failure(ErrorCode.INTERNAL_ERROR, ErrorCode.INTERNAL_ERROR.getDefaultMessage());
+    }
+
+    private static ResponseEntity<ApiResponse<Void>> failure(ErrorCode errorCode, String message) {
+        return ResponseEntity.status(errorCode.getHttpStatus())
+                .body(ApiResponse.failure(errorCode.getCode(), message));
+    }
+}

patbond-community/src/main/resources/application.yml.sample

@@ -0,0 +1,41 @@
+server:
+  port: ${PATBOND_COMMUNITY_PORT:8084}
+
+spring:
+  application:
+    name: patbond-community
+  datasource:
+    # 与 patbond-user 共库（MVP 单库多 schema）；本服务只读写 community schema
+    # （作者公开资料按 D3-9 方案 B 走 user 的 /internal 批量接口，后续波次落地）。
+    # Flyway 迁移链（V1..V5，含 community 基线）由 patbond-user 启动时统一执行，
+    # 本服务不携带 Flyway —— 单一 flyway_schema_history 归属不拆。
+    url: ${PATBOND_DB_URL:jdbc:postgresql://127.0.0.1:5432/patbond}
+    username: ${PATBOND_DB_USER:patbond}
+    password: ${PATBOND_DB_PASSWORD:patbond}
+
+# /api/v1/** 业务端点自骨架起即接 RS256 校验，与 patbond-user/pet 同一约定。
+patbond:
+  jwt:
+    # RS256 公钥，用于本地校验 patbond-auth 签发的 access token。
+    # 值可以是 PEM 文件路径，也可以是内联 PEM 内容（以 -----BEGIN 开头）。
+    # 私钥只给 patbond-auth，绝不入库。
+    public-key: ${PATBOND_JWT_PUBLIC_KEY:}
+  # 作者公开资料来源（D3-9 方案 B）：patbond-user 的 /internal 批量接口，
+  # ADR-002 静态直连。不可达时 Feed/详情照常返回，作者摘要降级为仅 userId。
+  user-service:
+    url: ${PATBOND_USER_SERVICE_URL:http://127.0.0.1:8082}
+  # /internal/** 服务间共享密钥，需与 patbond-user 配置同一值；生产环境必须
+  # 通过 PATBOND_INTERNAL_TOKEN 注入强随机值（如 `openssl rand -hex 32`）。
+  internal-token: ${PATBOND_INTERNAL_TOKEN:dev-only-internal-token}
+  author-profile:
+    # 作者公开资料的进程内缓存 TTL：昵称/头像变更最迟一分钟可见。
+    cache-ttl: ${PATBOND_AUTHOR_PROFILE_CACHE_TTL:60s}
+  media:
+    # 媒体读取侧（ADR-016 定型：私有桶 + 预签名 GET）。本服务只做本地 SigV4
+    # 签名计算生成图片访问 URL，从不直连对象存储；写入流程在 patbond-user。
+    # 环境变量与 patbond-user 共用同一组（一套部署一套旋钮）。
+    # public-endpoint 为空时服务照常启动，帖子响应中 media[].url 为 null。
+    public-endpoint: ${PATBOND_MINIO_PUBLIC_ENDPOINT:}
+    access-key: ${PATBOND_MINIO_ACCESS_KEY:}
+    secret-key: ${PATBOND_MINIO_SECRET_KEY:}
+    download-ttl: ${PATBOND_MEDIA_DOWNLOAD_TTL:1h}

patbond-community/src/test/java/com/patbond/patbond/community/CommunityApplicationTests.java

@@ -0,0 +1,18 @@
+package com.patbond.patbond.community;
+
+import org.junit.jupiter.api.Test;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+
+/**
+ * Context smoke test: the skeleton boots against a clean postgres:18 with
+ * the full V1..V5 migration chain applied from the test classpath.
+ */
+@SpringBootTest
+@Import(TestcontainersConfiguration.class)
+class CommunityApplicationTests {
+
+    @Test
+    void contextLoads() {
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/TestcontainersConfiguration.java

@@ -0,0 +1,27 @@
+package com.patbond.patbond.community;
+
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.boot.testcontainers.service.connection.ServiceConnection;
+import org.springframework.context.annotation.Bean;
+import org.testcontainers.containers.PostgreSQLContainer;
+import org.testcontainers.utility.DockerImageName;
+
+/**
+ * Shared Testcontainers setup: a disposable postgres:18 (the production
+ * target version) wired into the Spring context via @ServiceConnection.
+ * The production module carries no Flyway (the single migration chain is
+ * owned by patbond-user), but the TEST classpath adds patbond-user's jar
+ * plus Flyway, so Boot applies the full V1..V5 chain — including the
+ * community schema these tests exercise — to the fresh container exactly
+ * as the shared database gets it in production (same mechanism as
+ * patbond-pet).
+ */
+@TestConfiguration(proxyBeanMethods = false)
+public class TestcontainersConfiguration {
+
+    @Bean
+    @ServiceConnection
+    PostgreSQLContainer<?> postgresContainer() {
+        return new PostgreSQLContainer<>(DockerImageName.parse("postgres:18"));
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/author/AuthorProfileClientWireTest.java

@@ -0,0 +1,146 @@
+package com.patbond.patbond.community.author;
+
+import com.patbond.patbond.community.TestcontainersConfiguration;
+import com.patbond.patbond.community.dto.AuthorSummaryResponse;
+import com.patbond.patbond.community.support.CommunityTestData;
+import com.patbond.patbond.community.support.TestJwtKeys;
+import com.sun.net.httpserver.HttpServer;
+import org.junit.jupiter.api.AfterAll;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+
+import java.io.IOException;
+import java.io.OutputStream;
+import java.net.InetSocketAddress;
+import java.net.URLDecoder;
+import java.nio.charset.StandardCharsets;
+import java.util.Map;
+import java.util.UUID;
+import java.util.concurrent.ThreadLocalRandom;
+import java.util.concurrent.atomic.AtomicInteger;
+import java.util.concurrent.atomic.AtomicReference;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+/**
+ * The real Feign wiring against an in-test HTTP server standing in for
+ * patbond-user: static URL resolution, the X-Internal-Token interceptor,
+ * query-string batching, envelope decoding, avatar resolution through
+ * media.assets plus URL signing — and degradation when the downstream
+ * answers an error. (The /internal endpoint itself is tested in the
+ * patbond-user module; the DB-backed stub covers the service-level tests.)
+ */
+@SpringBootTest
+@Import(TestcontainersConfiguration.class)
+class AuthorProfileClientWireTest {
+
+    private static final HttpServer SERVER;
+    private static final AtomicReference<String> RESPONSE_BODY = new AtomicReference<>("");
+    private static final AtomicInteger RESPONSE_STATUS = new AtomicInteger(200);
+    private static final AtomicReference<String> SEEN_TOKEN = new AtomicReference<>();
+    private static final AtomicReference<String> SEEN_QUERY = new AtomicReference<>();
+
+    static {
+        try {
+            SERVER = HttpServer.create(new InetSocketAddress("127.0.0.1", 0), 0);
+        } catch (IOException e) {
+            throw new IllegalStateException(e);
+        }
+        SERVER.createContext("/internal/users/profiles", exchange -> {
+            SEEN_TOKEN.set(exchange.getRequestHeaders().getFirst("X-Internal-Token"));
+            SEEN_QUERY.set(exchange.getRequestURI().getRawQuery());
+            byte[] body = RESPONSE_BODY.get().getBytes(StandardCharsets.UTF_8);
+            exchange.getResponseHeaders().set("Content-Type", "application/json");
+            exchange.sendResponseHeaders(RESPONSE_STATUS.get(), body.length);
+            try (OutputStream out = exchange.getResponseBody()) {
+                out.write(body);
+            }
+        });
+        SERVER.start();
+    }
+
+    @DynamicPropertySource
+    static void properties(DynamicPropertyRegistry registry) {
+        registry.add("patbond.jwt.public-key", TestJwtKeys::publicPem);
+        registry.add("patbond.user-service.url",
+                () -> "http://127.0.0.1:" + SERVER.getAddress().getPort());
+        registry.add("patbond.media.public-endpoint", () -> "http://127.0.0.1:9000");
+        registry.add("patbond.media.access-key", () -> "test-access-key");
+        registry.add("patbond.media.secret-key", () -> "test-secret-key");
+    }
+
+    @AfterAll
+    static void stopServer() {
+        SERVER.stop(0);
+    }
+
+    @Autowired
+    private AuthorProfileGateway gateway;
+
+    @Autowired
+    private JdbcClient jdbcClient;
+
+    @BeforeEach
+    void resetServer() {
+        RESPONSE_STATUS.set(200);
+        RESPONSE_BODY.set("{\"code\":0,\"message\":\"success\",\"data\":[]}");
+        SEEN_TOKEN.set(null);
+        SEEN_QUERY.set(null);
+    }
+
+    private UUID newUser() {
+        return CommunityTestData.insertUser(jdbcClient,
+                "w" + Long.toHexString(ThreadLocalRandom.current().nextLong() & 0x7FFFFFFFFFFFFFFFL));
+    }
+
+    @Test
+    void presentsTheServiceSecretAndBatchesIdsIntoOneQuery() {
+        UUID userA = UUID.randomUUID();
+        UUID userB = UUID.randomUUID();
+        RESPONSE_BODY.set("""
+                {"code":0,"message":"success","data":[
+                  {"userId":"%s","nickname":"小白","avatarAssetId":null}
+                ]}""".formatted(userA));
+
+        Map<UUID, AuthorSummaryResponse> summaries =
+                gateway.summarize(java.util.List.of(userA, userB));
+
+        assertThat(SEEN_TOKEN.get()).isEqualTo("test-internal-token");
+        String ids = URLDecoder.decode(SEEN_QUERY.get(), StandardCharsets.UTF_8)
+                .replaceFirst("^ids=", "");
+        assertThat(ids.split(",")).containsExactlyInAnyOrder(
+                userA.toString(), userB.toString());
+        assertThat(summaries).containsOnlyKeys(userA);
+        assertThat(summaries.get(userA).nickname()).isEqualTo("小白");
+        assertThat(summaries.get(userA).avatarUrl()).isNull();
+    }
+
+    @Test
+    void resolvesTheAvatarAssetLocallyAndSignsTheUrl() {
+        UUID owner = newUser();
+        UUID assetId = CommunityTestData.insertReadyAsset(jdbcClient, owner);
+        RESPONSE_BODY.set("""
+                {"code":0,"message":"success","data":[
+                  {"userId":"%s","nickname":"有头像","avatarAssetId":"%s"}
+                ]}""".formatted(owner, assetId));
+
+        AuthorSummaryResponse summary = gateway.summarize(java.util.List.of(owner)).get(owner);
+        assertThat(summary.nickname()).isEqualTo("有头像");
+        assertThat(summary.avatarUrl())
+                .contains(assetId.toString())
+                .contains("X-Amz-Signature");
+    }
+
+    @Test
+    void aDownstreamErrorDegradesToNoSummaries() {
+        RESPONSE_STATUS.set(500);
+        RESPONSE_BODY.set("{\"code\":50000,\"message\":\"boom\",\"data\":null}");
+        assertThat(gateway.summarize(java.util.List.of(UUID.randomUUID()))).isEmpty();
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/contract/CommunityContractConformanceTest.java

@@ -0,0 +1,551 @@
+package com.patbond.patbond.community.contract;
+
+import com.jayway.jsonpath.JsonPath;
+import com.patbond.patbond.community.post.PostApiTestBase;
+import com.patbond.patbond.community.support.CommunityTestData;
+import org.junit.jupiter.api.MethodOrderer;
+import org.junit.jupiter.api.Order;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.TestMethodOrder;
+import org.springframework.http.HttpMethod;
+import org.springframework.http.MediaType;
+import org.springframework.test.web.servlet.MvcResult;
+import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
+
+import java.nio.charset.StandardCharsets;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.ConcurrentHashMap;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.patch;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.request;
+
+/**
+ * T3-20（M3 第二波收尾）：community 域 18 个操作补进契约一致性保障，机制与
+ * patbond-pet 的 ContractConformanceTest 同构——对冻结契约 v1.4.0（快照
+ * {@code src/test/resources/contract/openapi-v1.4.0.yaml}，正典在 doc 仓
+ * {@code docs/api/openapi.yaml}）逐操作真实起服务发请求，用
+ * {@link ContractValidator} 严格校验响应结构：路径/方法/状态码已声明、字段名
+ * 与类型、必填与 nullable、枚举与格式、信封结构、错误码值。
+ *
+ * <p>覆盖目标是**全响应矩阵**：最后的 {@link #everyDeclaredResponseCellIsExercised()}
+ * 断言契约为这 18 个操作声明的每一个 (操作, 状态码) 单元格（共 66 格）都被
+ * 至少一次真实响应校验过，**无豁免**——community 域的 409 均为幂等键/乐观锁
+ * 冲突、422 均为业务规则拒绝，单线程即可确定性触发。
+ *
+ * <p>media 域 2 个操作属 patbond-user 模块，由该模块的
+ * MediaContractConformanceTest 覆盖；auth/user 域 7 操作在 patbond-auth
+ * （含 v1.4.0 新增的 PATCH /api/v1/me）。快照四模块同一份。
+ */
+@TestMethodOrder(MethodOrderer.OrderAnnotation.class)
+class CommunityContractConformanceTest extends PostApiTestBase {
+
+    private static final OpenApiContract CONTRACT = OpenApiContract.load();
+    private static final ContractValidator VALIDATOR = new ContractValidator(CONTRACT);
+
+    /** 已被真实响应校验过的 (操作, 状态码) 单元格，如 "GET /api/v1/feed 200"。 */
+    private static final Set<String> COVERED = ConcurrentHashMap.newKeySet();
+
+    /** community 域 18 个操作（= 契约中 tags ∈ {posts, feed, comments, interactions, follows}）。 */
+    private static final List<String> COMMUNITY_OPERATIONS = List.of(
+            "POST /api/v1/posts",
+            "GET /api/v1/posts/{postId}",
+            "PATCH /api/v1/posts/{postId}",
+            "DELETE /api/v1/posts/{postId}",
+            "GET /api/v1/me/posts",
+            "GET /api/v1/feed",
+            "GET /api/v1/posts/{postId}/comments",
+            "POST /api/v1/posts/{postId}/comments",
+            "DELETE /api/v1/comments/{commentId}",
+            "PUT /api/v1/posts/{postId}/like",
+            "DELETE /api/v1/posts/{postId}/like",
+            "PUT /api/v1/posts/{postId}/bookmark",
+            "DELETE /api/v1/posts/{postId}/bookmark",
+            "GET /api/v1/me/bookmarks",
+            "PUT /api/v1/users/{userId}/follow",
+            "DELETE /api/v1/users/{userId}/follow",
+            "GET /api/v1/users/{userId}/follow-stats",
+            "GET /api/v1/me/community-stats");
+
+    private static final String IDEMPOTENCY_KEY = "Idempotency-Key";
+
+    // ---- 校验骨架 ------------------------------------------------------
+
+    /**
+     * 执行请求，断言 HTTP 状态，并将响应体对照冻结契约严格校验；通过后把
+     * (操作, 状态码) 记入覆盖表。返回响应体供取 id/cursor。
+     */
+    private String verified(MockHttpServletRequestBuilder rq, String method,
+                            String pathTemplate, int expectedStatus) throws Exception {
+        MvcResult result = mockMvc.perform(rq).andReturn();
+        int actual = result.getResponse().getStatus();
+        String body = result.getResponse().getContentAsString(StandardCharsets.UTF_8);
+        assertThat(actual)
+                .as("%s %s 的 HTTP 状态（响应体: %s）", method, pathTemplate, body)
+                .isEqualTo(expectedStatus);
+        List<String> drift = VALIDATOR.validateResponse(method, pathTemplate, actual, body);
+        assertThat(drift).as("%s %s %d 响应与冻结契约漂移", method, pathTemplate, actual).isEmpty();
+        COVERED.add(method + " " + pathTemplate + " " + actual);
+        return body;
+    }
+
+    /** 同上，并额外断言信封 code 等于契约错误码表约定的业务码。 */
+    private String verifiedError(MockHttpServletRequestBuilder rq, String method,
+                                 String pathTemplate, int status, int bizCode) throws Exception {
+        String body = verified(rq, method, pathTemplate, status);
+        assertThat((Integer) JsonPath.read(body, "$.code"))
+                .as("%s %s %d 的业务错误码", method, pathTemplate, status)
+                .isEqualTo(bizCode);
+        return body;
+    }
+
+    /** 经 verified 的创建（响应同样被契约校验），返回帖子 id。 */
+    private String newPost(UUID author, String body) throws Exception {
+        String created = verified(
+                createPostRequest(author, UUID.randomUUID().toString(), body),
+                "POST", "/api/v1/posts", 201);
+        return JsonPath.read(created, "$.data.id");
+    }
+
+    private String newPublishedPost(UUID author, String content) throws Exception {
+        return newPost(author, """
+                {"content":"%s","status":"published"}
+                """.formatted(content));
+    }
+
+    private String newComment(UUID author, String postId, String content) throws Exception {
+        String created = verified(
+                authed(post("/api/v1/posts/{postId}/comments", postId), author)
+                        .header(IDEMPOTENCY_KEY, UUID.randomUUID().toString())
+                        .content("{\"content\":\"%s\"}".formatted(content)),
+                "POST", "/api/v1/posts/{postId}/comments", 201);
+        return JsonPath.read(created, "$.data.id");
+    }
+
+    // ---- 成功路径：18 操作全覆盖 ---------------------------------------
+
+    @Test
+    @Order(1)
+    void postLifecycleSuccessShapes() throws Exception {
+        UUID author = newUser();
+        UUID petId = CommunityTestData.insertPetOwnedBy(jdbcClient, author);
+        UUID asset = CommunityTestData.insertReadyAsset(jdbcClient, author);
+
+        // 全字段草稿（petId + 单图封面 + caption）
+        String draftId = newPost(author, """
+                {"title":"契约帖","content":"全字段草稿正文","category":"help",
+                 "status":"draft","petId":"%s",
+                 "media":[{"assetId":"%s","position":0,"isCover":true,"caption":"封面图"}]}
+                """.formatted(petId, asset));
+
+        // 可空字段全空的纯文字直接发布形态（nullable 声明的实证）
+        newPublishedPost(author, "契约纯文字发布帖");
+
+        verified(get("/api/v1/posts/{postId}", draftId)
+                        .header("Authorization", "Bearer " + token(author)),
+                "GET", "/api/v1/posts/{postId}", 200);
+
+        // 发布草稿（draft→published 唯一开放迁移）
+        String published = verified(authed(patch("/api/v1/posts/{postId}", draftId), author)
+                        .content("{\"version\":0,\"status\":\"published\"}"),
+                "PATCH", "/api/v1/posts/{postId}", 200);
+        assertThat((String) JsonPath.read(published, "$.data.status")).isEqualTo("published");
+        assertThat((Object) JsonPath.read(published, "$.data.publishedAt")).isNotNull();
+
+        // 我的帖子列表：keyset 翻页两态 + status 过滤
+        String page1 = verified(get("/api/v1/me/posts").param("limit", "1")
+                        .header("Authorization", "Bearer " + token(author)),
+                "GET", "/api/v1/me/posts", 200);
+        assertThat((Boolean) JsonPath.read(page1, "$.data.hasMore")).isTrue();
+        String cursor = JsonPath.read(page1, "$.data.nextCursor");
+        assertThat(cursor).as("hasMore=true 时 nextCursor 非空").isNotNull();
+        verified(get("/api/v1/me/posts").param("limit", "1").param("cursor", cursor)
+                        .header("Authorization", "Bearer " + token(author)),
+                "GET", "/api/v1/me/posts", 200);
+        verified(get("/api/v1/me/posts").param("status", "draft")
+                        .header("Authorization", "Bearer " + token(author)),
+                "GET", "/api/v1/me/posts", 200);
+
+        // 软删（VoidEnvelope）
+        String victim = newPublishedPost(author, "契约待删帖");
+        verified(authed(delete("/api/v1/posts/{postId}", victim), author),
+                "DELETE", "/api/v1/posts/{postId}", 200);
+    }
+
+    @Test
+    @Order(2)
+    void feedSuccessShapes() throws Exception {
+        UUID author = newUser();
+        UUID reader = newUser();
+        UUID asset = CommunityTestData.insertReadyAsset(jdbcClient, author);
+
+        // 有封面与纯文字两种卡片形态（coverImage 的 allOf 非空/null 两分支）
+        newPost(author, """
+                {"title":"契约图帖","content":"Feed 封面卡片","status":"published",
+                 "media":[{"assetId":"%s","isCover":true}]}
+                """.formatted(asset));
+        newPublishedPost(author, "Feed 纯文字卡片");
+
+        String page1 = verified(get("/api/v1/feed").param("limit", "1")
+                        .header("Authorization", "Bearer " + token(reader)),
+                "GET", "/api/v1/feed", 200);
+        assertThat((Boolean) JsonPath.read(page1, "$.data.hasMore")).isTrue();
+        String cursor = JsonPath.read(page1, "$.data.nextCursor");
+        verified(get("/api/v1/feed").param("cursor", cursor)
+                        .header("Authorization", "Bearer " + token(reader)),
+                "GET", "/api/v1/feed", 200);
+    }
+
+    @Test
+    @Order(3)
+    void commentSuccessShapes() throws Exception {
+        UUID author = newUser();
+        UUID commenter = newUser();
+        String postId = newPublishedPost(author, "契约评论帖");
+
+        // 普通评论与 @ 回复（replyToUser 的 allOf null/非空两分支）
+        newComment(commenter, postId, "普通评论");
+        verified(authed(post("/api/v1/posts/{postId}/comments", postId), author)
+                        .header(IDEMPOTENCY_KEY, UUID.randomUUID().toString())
+                        .content("""
+                                {"content":"@ 回复","replyToUserId":"%s"}
+                                """.formatted(commenter)),
+                "POST", "/api/v1/posts/{postId}/comments", 201);
+
+        String page1 = verified(get("/api/v1/posts/{postId}/comments", postId)
+                        .param("limit", "1")
+                        .header("Authorization", "Bearer " + token(commenter)),
+                "GET", "/api/v1/posts/{postId}/comments", 200);
+        assertThat((Boolean) JsonPath.read(page1, "$.data.hasMore")).isTrue();
+        String cursor = JsonPath.read(page1, "$.data.nextCursor");
+        verified(get("/api/v1/posts/{postId}/comments", postId)
+                        .param("cursor", cursor)
+                        .header("Authorization", "Bearer " + token(commenter)),
+                "GET", "/api/v1/posts/{postId}/comments", 200);
+
+        // 作者软删自己的评论（VoidEnvelope）
+        String commentId = newComment(commenter, postId, "待删评论");
+        verified(authed(delete("/api/v1/comments/{commentId}", commentId), commenter),
+                "DELETE", "/api/v1/comments/{commentId}", 200);
+    }
+
+    @Test
+    @Order(4)
+    void interactionSuccessShapes() throws Exception {
+        UUID author = newUser();
+        UUID actor = newUser();
+        String postA = newPublishedPost(author, "契约互动帖 A");
+        String postB = newPublishedPost(author, "契约互动帖 B");
+
+        // PUT/DELETE 权威终态（重复 PUT 同格，幂等语义顺带实证）
+        verified(authed(put("/api/v1/posts/{postId}/like", postA), actor),
+                "PUT", "/api/v1/posts/{postId}/like", 200);
+        String likedAgain = verified(authed(put("/api/v1/posts/{postId}/like", postA), actor),
+                "PUT", "/api/v1/posts/{postId}/like", 200);
+        assertThat((Boolean) JsonPath.read(likedAgain, "$.data.liked")).isTrue();
+        assertThat((Integer) JsonPath.read(likedAgain, "$.data.likeCount")).isEqualTo(1);
+        verified(authed(delete("/api/v1/posts/{postId}/like", postA), actor),
+                "DELETE", "/api/v1/posts/{postId}/like", 200);
+
+        verified(authed(put("/api/v1/posts/{postId}/bookmark", postA), actor),
+                "PUT", "/api/v1/posts/{postId}/bookmark", 200);
+        verified(authed(put("/api/v1/posts/{postId}/bookmark", postB), actor),
+                "PUT", "/api/v1/posts/{postId}/bookmark", 200);
+
+        String page1 = verified(get("/api/v1/me/bookmarks").param("limit", "1")
+                        .header("Authorization", "Bearer " + token(actor)),
+                "GET", "/api/v1/me/bookmarks", 200);
+        assertThat((Boolean) JsonPath.read(page1, "$.data.hasMore")).isTrue();
+        String cursor = JsonPath.read(page1, "$.data.nextCursor");
+        verified(get("/api/v1/me/bookmarks").param("cursor", cursor)
+                        .header("Authorization", "Bearer " + token(actor)),
+                "GET", "/api/v1/me/bookmarks", 200);
+
+        verified(authed(delete("/api/v1/posts/{postId}/bookmark", postB), actor),
+                "DELETE", "/api/v1/posts/{postId}/bookmark", 200);
+    }
+
+    @Test
+    @Order(5)
+    void followSuccessShapes() throws Exception {
+        UUID follower = newUser();
+        UUID followee = newUser();
+
+        String followed = verified(authed(put("/api/v1/users/{userId}/follow", followee), follower),
+                "PUT", "/api/v1/users/{userId}/follow", 200);
+        assertThat((Boolean) JsonPath.read(followed, "$.data.following")).isTrue();
+
+        String stats = verified(get("/api/v1/users/{userId}/follow-stats", followee)
+                        .header("Authorization", "Bearer " + token(follower)),
+                "GET", "/api/v1/users/{userId}/follow-stats", 200);
+        assertThat((Boolean) JsonPath.read(stats, "$.data.followedByMe")).isTrue();
+
+        // 查自己：followedByMe 恒 false 分支
+        verified(get("/api/v1/users/{userId}/follow-stats", follower)
+                        .header("Authorization", "Bearer " + token(follower)),
+                "GET", "/api/v1/users/{userId}/follow-stats", 200);
+
+        verified(authed(delete("/api/v1/users/{userId}/follow", followee), follower),
+                "DELETE", "/api/v1/users/{userId}/follow", 200);
+        // 取消不存在的关注：幂等 no-op 仍 200 权威 false
+        String unfollowedAgain = verified(
+                authed(delete("/api/v1/users/{userId}/follow", followee), follower),
+                "DELETE", "/api/v1/users/{userId}/follow", 200);
+        assertThat((Boolean) JsonPath.read(unfollowedAgain, "$.data.following")).isFalse();
+    }
+
+    /**
+     * `GET /api/v1/me/community-stats`（v1.4.0 新增操作，T3.5-07）：空数据零值
+     * 与有数据两个分支都过严格校验。**永不 404**，故本操作只有 200/401 两格
+     * （401 由 {@link #unauthenticatedRequestsAnswer40101OnAllOperations()} 的
+     * 全操作循环覆盖）。
+     */
+    @Test
+    @Order(51)
+    void myCommunityStatsSuccessShapes() throws Exception {
+        UUID fresh = newUser();
+
+        // 空数据：两数为 0 而非 null，且不是 404
+        String zeros = verified(get("/api/v1/me/community-stats")
+                        .header("Authorization", "Bearer " + token(fresh)),
+                "GET", "/api/v1/me/community-stats", 200);
+        assertThat(((Number) JsonPath.read(zeros, "$.data.receivedLikeCount")).longValue())
+                .isZero();
+        assertThat(((Number) JsonPath.read(zeros, "$.data.publishedPostCount")).longValue())
+                .isZero();
+
+        // 有数据：两篇已发布帖，其中一篇被他人赞一次 → 1 赞 / 2 作品
+        UUID author = newUser();
+        UUID fan = newUser();
+        String postA = newPublishedPost(author, "契约统计帖甲");
+        newPublishedPost(author, "契约统计帖乙");
+        verified(authed(put("/api/v1/posts/{postId}/like", postA), fan),
+                "PUT", "/api/v1/posts/{postId}/like", 200);
+
+        String counted = verified(get("/api/v1/me/community-stats")
+                        .header("Authorization", "Bearer " + token(author)),
+                "GET", "/api/v1/me/community-stats", 200);
+        assertThat(((Number) JsonPath.read(counted, "$.data.receivedLikeCount")).longValue())
+                .isEqualTo(1L);
+        assertThat(((Number) JsonPath.read(counted, "$.data.publishedPostCount")).longValue())
+                .isEqualTo(2L);
+    }
+
+    // ---- 错误信封 ------------------------------------------------------
+
+    @Test
+    @Order(6)
+    void unauthenticatedRequestsAnswer40101OnAllOperations() throws Exception {
+        for (String op : COMMUNITY_OPERATIONS) {
+            String[] parts = op.split(" ", 2);
+            String url = parts[1].replaceAll("\\{[^}]+}", UUID.randomUUID().toString());
+            MockHttpServletRequestBuilder rq = request(HttpMethod.valueOf(parts[0]), url);
+            if (!"GET".equals(parts[0])) {
+                rq = rq.contentType(MediaType.APPLICATION_JSON).content("{}");
+            }
+            verifiedError(rq, parts[0], parts[1], 401, 40101);
+        }
+    }
+
+    @Test
+    @Order(7)
+    void validationErrorsAnswer40000() throws Exception {
+        UUID user = newUser();
+        String postId = newPublishedPost(user, "契约校验帖");
+
+        // 创建：缺 Idempotency-Key 与空 body 两种 40000
+        verifiedError(authed(post("/api/v1/posts"), user).content("{\"content\":\"无幂等键\"}"),
+                "POST", "/api/v1/posts", 400, 40000);
+        verifiedError(createPostRequest(user, UUID.randomUUID().toString(), "{}"),
+                "POST", "/api/v1/posts", 400, 40000);
+        // PATCH：缺 version
+        verifiedError(authed(patch("/api/v1/posts/{postId}", postId), user)
+                        .content("{\"content\":\"缺版本\"}"),
+                "PATCH", "/api/v1/posts/{postId}", 400, 40000);
+
+        verifiedError(get("/api/v1/me/posts").param("limit", "0")
+                        .header("Authorization", "Bearer " + token(user)),
+                "GET", "/api/v1/me/posts", 400, 40000);
+        verifiedError(get("/api/v1/feed").param("cursor", "not-a-cursor")
+                        .header("Authorization", "Bearer " + token(user)),
+                "GET", "/api/v1/feed", 400, 40000);
+        verifiedError(get("/api/v1/posts/{postId}/comments", postId).param("limit", "101")
+                        .header("Authorization", "Bearer " + token(user)),
+                "GET", "/api/v1/posts/{postId}/comments", 400, 40000);
+        verifiedError(authed(post("/api/v1/posts/{postId}/comments", postId), user)
+                        .header(IDEMPOTENCY_KEY, UUID.randomUUID().toString())
+                        .content("{}"),
+                "POST", "/api/v1/posts/{postId}/comments", 400, 40000);
+        verifiedError(get("/api/v1/me/bookmarks").param("cursor", "broken")
+                        .header("Authorization", "Bearer " + token(user)),
+                "GET", "/api/v1/me/bookmarks", 400, 40000);
+    }
+
+    @Test
+    @Order(8)
+    void antiEnumerationAndPermissionErrorsMatchContract() throws Exception {
+        UUID author = newUser();
+        UUID other = newUser();
+        String ghost = UUID.randomUUID().toString();
+
+        // -- 40403：帖子防枚举（不存在 / 他人 draft 同响应）--
+        verifiedError(get("/api/v1/posts/{postId}", ghost)
+                        .header("Authorization", "Bearer " + token(author)),
+                "GET", "/api/v1/posts/{postId}", 404, 40403);
+        String draftId = newPost(author, "{\"content\":\"他人不可见草稿\"}");
+        verifiedError(authed(patch("/api/v1/posts/{postId}", draftId), other)
+                        .content("{\"version\":0,\"content\":\"越权\"}"),
+                "PATCH", "/api/v1/posts/{postId}", 404, 40403);
+        verifiedError(authed(delete("/api/v1/posts/{postId}", ghost), author),
+                "DELETE", "/api/v1/posts/{postId}", 404, 40403);
+        verifiedError(get("/api/v1/posts/{postId}/comments", draftId)
+                        .header("Authorization", "Bearer " + token(other)),
+                "GET", "/api/v1/posts/{postId}/comments", 404, 40403);
+        // 互动面 = 帖子公开面：作者本人草稿同样 40403
+        verifiedError(authed(put("/api/v1/posts/{postId}/like", draftId), author),
+                "PUT", "/api/v1/posts/{postId}/like", 404, 40403);
+        verifiedError(authed(delete("/api/v1/posts/{postId}/like", draftId), author),
+                "DELETE", "/api/v1/posts/{postId}/like", 404, 40403);
+        verifiedError(authed(put("/api/v1/posts/{postId}/bookmark", ghost), author),
+                "PUT", "/api/v1/posts/{postId}/bookmark", 404, 40403);
+        verifiedError(authed(delete("/api/v1/posts/{postId}/bookmark", ghost), author),
+                "DELETE", "/api/v1/posts/{postId}/bookmark", 404, 40403);
+
+        // -- 创建帖子的 404 双业务码：40401 幽灵宠物 / 40405 幽灵 asset --
+        verifiedError(createPostRequest(author, UUID.randomUUID().toString(), """
+                        {"content":"幽灵宠物","petId":"%s"}
+                        """.formatted(ghost)),
+                "POST", "/api/v1/posts", 404, 40401);
+        verifiedError(createPostRequest(author, UUID.randomUUID().toString(), """
+                        {"content":"幽灵媒体","media":[{"assetId":"%s"}]}
+                        """.formatted(ghost)),
+                "POST", "/api/v1/posts", 404, 40405);
+
+        // -- 评论的 404 双业务码：40403 帖子不可见 / 40406 幽灵 @ 目标 --
+        String postId = newPublishedPost(author, "契约错误评论帖");
+        verifiedError(authed(post("/api/v1/posts/{postId}/comments", draftId), other)
+                        .header(IDEMPOTENCY_KEY, UUID.randomUUID().toString())
+                        .content("{\"content\":\"评论他人草稿\"}"),
+                "POST", "/api/v1/posts/{postId}/comments", 404, 40403);
+        verifiedError(authed(post("/api/v1/posts/{postId}/comments", postId), other)
+                        .header(IDEMPOTENCY_KEY, UUID.randomUUID().toString())
+                        .content("""
+                                {"content":"@ 幽灵","replyToUserId":"%s"}
+                                """.formatted(ghost)),
+                "POST", "/api/v1/posts/{postId}/comments", 404, 40406);
+        verifiedError(authed(delete("/api/v1/comments/{commentId}", ghost), author),
+                "DELETE", "/api/v1/comments/{commentId}", 404, 40404);
+
+        // -- 40406：关注三端点的幽灵目标 --
+        verifiedError(authed(put("/api/v1/users/{userId}/follow", ghost), author),
+                "PUT", "/api/v1/users/{userId}/follow", 404, 40406);
+        verifiedError(authed(delete("/api/v1/users/{userId}/follow", ghost), author),
+                "DELETE", "/api/v1/users/{userId}/follow", 404, 40406);
+        verifiedError(get("/api/v1/users/{userId}/follow-stats", ghost)
+                        .header("Authorization", "Bearer " + token(author)),
+                "GET", "/api/v1/users/{userId}/follow-stats", 404, 40406);
+
+        // -- 40301：可见但无权限（他人已发布帖改/删、他人可见评论删——含帖主）--
+        verifiedError(authed(patch("/api/v1/posts/{postId}", postId), other)
+                        .content("{\"version\":0,\"content\":\"越权改\"}"),
+                "PATCH", "/api/v1/posts/{postId}", 403, 40301);
+        verifiedError(authed(delete("/api/v1/posts/{postId}", postId), other),
+                "DELETE", "/api/v1/posts/{postId}", 403, 40301);
+        String commentId = newComment(other, postId, "帖主也删不得");
+        verifiedError(authed(delete("/api/v1/comments/{commentId}", commentId), author),
+                "DELETE", "/api/v1/comments/{commentId}", 403, 40301);
+    }
+
+    @Test
+    @Order(9)
+    void conflictAndRuleErrorsMatchContract() throws Exception {
+        UUID author = newUser();
+        UUID self = author;
+
+        // -- 409/40905：同幂等键不同 payload（帖子与评论）--
+        String key = UUID.randomUUID().toString();
+        verified(createPostRequest(author, key, "{\"content\":\"首次提交\"}"),
+                "POST", "/api/v1/posts", 201);
+        verifiedError(createPostRequest(author, key, "{\"content\":\"同键不同内容\"}"),
+                "POST", "/api/v1/posts", 409, 40905);
+
+        String postId = newPublishedPost(author, "契约冲突帖");
+        String commentKey = UUID.randomUUID().toString();
+        verified(authed(post("/api/v1/posts/{postId}/comments", postId), author)
+                        .header(IDEMPOTENCY_KEY, commentKey)
+                        .content("{\"content\":\"首次评论\"}"),
+                "POST", "/api/v1/posts/{postId}/comments", 201);
+        verifiedError(authed(post("/api/v1/posts/{postId}/comments", postId), author)
+                        .header(IDEMPOTENCY_KEY, commentKey)
+                        .content("{\"content\":\"同键不同评论\"}"),
+                "POST", "/api/v1/posts/{postId}/comments", 409, 40905);
+
+        // -- 409/40902：乐观锁过期（先成功一次把 version 顶到 1）--
+        verified(authed(patch("/api/v1/posts/{postId}", postId), author)
+                        .content("{\"version\":0,\"content\":\"第一次改\"}"),
+                "PATCH", "/api/v1/posts/{postId}", 200);
+        verifiedError(authed(patch("/api/v1/posts/{postId}", postId), author)
+                        .content("{\"version\":0,\"content\":\"过期版本\"}"),
+                "PATCH", "/api/v1/posts/{postId}", 409, 40902);
+
+        // -- 422/42203：引用本人 uploading asset（创建与编辑）--
+        UUID uploading = CommunityTestData.insertAsset(jdbcClient, author, "uploading");
+        verifiedError(createPostRequest(author, UUID.randomUUID().toString(), """
+                        {"content":"未就绪媒体","media":[{"assetId":"%s"}]}
+                        """.formatted(uploading)),
+                "POST", "/api/v1/posts", 422, 42203);
+        verifiedError(authed(patch("/api/v1/posts/{postId}", postId), author)
+                        .content("""
+                                {"version":1,"media":[{"assetId":"%s"}]}
+                                """.formatted(uploading)),
+                "PATCH", "/api/v1/posts/{postId}", 422, 42203);
+
+        // -- 422/42204：自关注（仅 PUT；自取关 200 已在 Order(5) 语义内）--
+        verifiedError(authed(put("/api/v1/users/{userId}/follow", self), self),
+                "PUT", "/api/v1/users/{userId}/follow", 422, 42204);
+    }
+
+    // ---- 快照与覆盖门禁 -------------------------------------------------
+
+    /**
+     * 冻结快照守卫：与 pet/auth 侧同一纪律——正典契约升版时必须同步复制新快照
+     * 并更新期望值，忘记同步在 CI 立即变红。
+     */
+    @Test
+    @Order(98)
+    void frozenSnapshotIsTheExpectedContractVersion() {
+        assertThat(CONTRACT.version()).isEqualTo("1.4.0");
+        assertThat(CONTRACT.paths()).hasSize(32);
+        assertThat(CONTRACT.operations()).hasSize(45);
+        assertThat(CONTRACT.schemas()).hasSize(75);
+        assertThat(CONTRACT.operationsTagged(
+                Set.of("posts", "feed", "comments", "interactions", "follows")))
+                .containsExactlyInAnyOrderElementsOf(COMMUNITY_OPERATIONS);
+    }
+
+    /**
+     * 全矩阵覆盖门禁：community 域 18 个操作声明的每个 (操作, 状态码) 都必须被
+     * 前面的测试真实触发并通过契约校验（66 个单元格，无豁免）。
+     */
+    @Test
+    @Order(99)
+    void everyDeclaredResponseCellIsExercised() {
+        List<String> missing = new ArrayList<>();
+        for (String op : COMMUNITY_OPERATIONS) {
+            for (int status : CONTRACT.responseStatuses(op)) {
+                String cell = op + " " + status;
+                if (!COVERED.contains(cell)) {
+                    missing.add(cell);
+                }
+            }
+        }
+        assertThat(missing).as("契约声明但未被契约测试触发的响应单元格").isEmpty();
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/contract/ContractValidator.java

@@ -0,0 +1,256 @@
+package com.patbond.patbond.community.contract;
+
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+import java.math.BigDecimal;
+import java.time.LocalDate;
+import java.time.OffsetDateTime;
+import java.time.format.DateTimeParseException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.LinkedHashMap;
+import java.util.List;
+import java.util.Map;
+
+import static com.patbond.patbond.community.contract.OpenApiContract.cast;
+import static com.patbond.patbond.community.contract.OpenApiContract.list;
+import static com.patbond.patbond.community.contract.OpenApiContract.map;
+
+/**
+ * Validates an actual HTTP response against the frozen contract, strictly:
+ *
+ * <ul>
+ *   <li>the operation and the status must be declared;</li>
+ *   <li>required fields must be present; a null value needs {@code nullable};</li>
+ *   <li>fields the schema does not declare are rejected (this is what catches
+ *       a renamed or newly leaked field — plain OpenAPI semantics would allow
+ *       extra properties, but the frozen contract is "exactly these fields");</li>
+ *   <li>types, enum membership, uuid / date-time / date formats and
+ *       min/max(Length) bounds are checked.</li>
+ * </ul>
+ *
+ * Behavioural semantics (state machines, anti-enumeration, permission logic)
+ * stay with the existing integration tests — this class only pins structure.
+ */
+final class ContractValidator {
+
+    private static final ObjectMapper MAPPER = new ObjectMapper();
+
+    private final OpenApiContract contract;
+
+    ContractValidator(OpenApiContract contract) {
+        this.contract = contract;
+    }
+
+    /**
+     * @return drift findings, empty when the response conforms; each entry is
+     *         a human-readable "where: what" line
+     */
+    List<String> validateResponse(String method, String pathTemplate, int status, String body) {
+        List<String> errors = new ArrayList<>();
+        String opKey = method + " " + pathTemplate;
+        Map<String, Object> op = contract.operation(opKey);
+        if (op == null) {
+            errors.add("契约未声明该操作: " + opKey);
+            return errors;
+        }
+        Object respNode = map(op, "responses").get(String.valueOf(status));
+        if (respNode == null) {
+            errors.add("契约未为 " + opKey + " 声明状态码 " + status);
+            return errors;
+        }
+        Map<String, Object> content = map(contract.resolve(cast(respNode)), "content");
+        if (content == null) {
+            return errors; // response declared without a body
+        }
+        Map<String, Object> schema = map(map(content, "application/json"), "schema");
+        if (schema == null) {
+            errors.add(opKey + " " + status + ": 契约声明了 content 但无 application/json schema");
+            return errors;
+        }
+        JsonNode node;
+        try {
+            node = MAPPER.readTree(body);
+        } catch (JsonProcessingException e) {
+            errors.add(opKey + " " + status + ": 响应体不是合法 JSON: " + e.getOriginalMessage());
+            return errors;
+        }
+        validate(schema, node, "$", errors);
+        return errors;
+    }
+
+    private void validate(Map<String, Object> rawSchema, JsonNode node, String loc, List<String> errors) {
+        Map<String, Object> schema = effectiveSchema(rawSchema);
+        if (node == null || node.isMissingNode()) {
+            errors.add(loc + ": 字段缺失");
+            return;
+        }
+        if (node.isNull()) {
+            if (!Boolean.TRUE.equals(schema.get("nullable"))) {
+                errors.add(loc + ": 为 null，但契约未声明 nullable");
+            }
+            return;
+        }
+        List<Object> allowed = list(schema, "enum");
+        if (allowed != null && !enumMatches(allowed, node)) {
+            errors.add(loc + ": 值 " + node + " 不在契约枚举 " + allowed + " 内");
+        }
+        String type = (String) schema.get("type");
+        if (type == null) {
+            type = schema.containsKey("properties") ? "object" : null;
+        }
+        if (type == null) {
+            return;
+        }
+        switch (type) {
+            case "object" -> validateObject(schema, node, loc, errors);
+            case "array" -> validateArray(schema, node, loc, errors);
+            case "string" -> validateString(schema, node, loc, errors);
+            case "integer" -> {
+                if (!node.isIntegralNumber()) {
+                    errors.add(loc + ": 应为 integer，实际 " + node.getNodeType() + " " + node);
+                } else {
+                    checkRange(schema, node.decimalValue(), loc, errors);
+                }
+            }
+            case "number" -> {
+                if (!node.isNumber()) {
+                    errors.add(loc + ": 应为 number，实际 " + node.getNodeType() + " " + node);
+                } else {
+                    checkRange(schema, node.decimalValue(), loc, errors);
+                }
+            }
+            case "boolean" -> {
+                if (!node.isBoolean()) {
+                    errors.add(loc + ": 应为 boolean，实际 " + node.getNodeType() + " " + node);
+                }
+            }
+            default -> errors.add(loc + ": 契约测试不支持的 type " + type);
+        }
+    }
+
+    /**
+     * Resolves $refs and flattens the v1.3.0 {@code nullable + allOf: [$ref]}
+     * pattern into one plain schema (branch keys first, sibling keys — e.g.
+     * the outer {@code nullable} — win). The frozen contract only ever uses
+     * single-branch allOf, so a shallow merge is exact; overlapping
+     * {@code properties} across branches would need a deep merge and are not
+     * supported.
+     */
+    private Map<String, Object> effectiveSchema(Map<String, Object> rawSchema) {
+        Map<String, Object> schema = contract.resolve(rawSchema);
+        List<Object> allOf = list(schema, "allOf");
+        if (allOf == null) {
+            return schema;
+        }
+        Map<String, Object> merged = new LinkedHashMap<>();
+        for (Object branch : allOf) {
+            merged.putAll(effectiveSchema(cast(branch)));
+        }
+        schema.forEach((key, value) -> {
+            if (!"allOf".equals(key)) {
+                merged.put(key, value);
+            }
+        });
+        return merged;
+    }
+
+    private void validateObject(Map<String, Object> schema, JsonNode node, String loc, List<String> errors) {
+        if (!node.isObject()) {
+            errors.add(loc + ": 应为 object，实际 " + node.getNodeType());
+            return;
+        }
+        Map<String, Object> props = map(schema, "properties");
+        List<Object> required = list(schema, "required");
+        if (required != null) {
+            for (Object r : required) {
+                if (!node.has((String) r)) {
+                    errors.add(loc + "." + r + ": 契约必填字段缺失");
+                }
+            }
+        }
+        Object additional = schema.get("additionalProperties");
+        boolean open = Boolean.TRUE.equals(additional) || additional instanceof Map;
+        Iterator<Map.Entry<String, JsonNode>> fields = node.fields();
+        while (fields.hasNext()) {
+            Map.Entry<String, JsonNode> field = fields.next();
+            Map<String, Object> propSchema = props == null ? null : cast(props.get(field.getKey()));
+            if (propSchema != null) {
+                validate(propSchema, field.getValue(), loc + "." + field.getKey(), errors);
+            } else if (!open) {
+                errors.add(loc + "." + field.getKey() + ": 契约未声明的字段（结构漂移）");
+            }
+        }
+    }
+
+    private void validateArray(Map<String, Object> schema, JsonNode node, String loc, List<String> errors) {
+        if (!node.isArray()) {
+            errors.add(loc + ": 应为 array，实际 " + node.getNodeType());
+            return;
+        }
+        Map<String, Object> items = map(schema, "items");
+        if (items == null) {
+            return;
+        }
+        int i = 0;
+        for (JsonNode element : node) {
+            validate(items, element, loc + "[" + i++ + "]", errors);
+        }
+    }
+
+    private void validateString(Map<String, Object> schema, JsonNode node, String loc, List<String> errors) {
+        if (!node.isTextual()) {
+            errors.add(loc + ": 应为 string，实际 " + node.getNodeType() + " " + node);
+            return;
+        }
+        String value = node.asText();
+        String format = (String) schema.get("format");
+        if (format != null) {
+            try {
+                switch (format) {
+                    case "uuid" -> {
+                        if (value.length() != 36) {
+                            throw new IllegalArgumentException("非规范 UUID 长度");
+                        }
+                        java.util.UUID.fromString(value);
+                    }
+                    case "date-time" -> OffsetDateTime.parse(value);
+                    case "date" -> LocalDate.parse(value);
+                    default -> { /* password 等纯标注格式不校验 */ }
+                }
+            } catch (IllegalArgumentException | DateTimeParseException e) {
+                errors.add(loc + ": \"" + value + "\" 不符合 format=" + format);
+            }
+        }
+        if (schema.get("minLength") instanceof Number min && value.length() < min.intValue()) {
+            errors.add(loc + ": 长度 " + value.length() + " 小于契约 minLength " + min);
+        }
+        if (schema.get("maxLength") instanceof Number max && value.length() > max.intValue()) {
+            errors.add(loc + ": 长度 " + value.length() + " 大于契约 maxLength " + max);
+        }
+    }
+
+    private static void checkRange(Map<String, Object> schema, BigDecimal value, String loc, List<String> errors) {
+        if (schema.get("minimum") instanceof Number min
+                && value.compareTo(new BigDecimal(min.toString())) < 0) {
+            errors.add(loc + ": 值 " + value + " 小于契约 minimum " + min);
+        }
+        if (schema.get("maximum") instanceof Number max
+                && value.compareTo(new BigDecimal(max.toString())) > 0) {
+            errors.add(loc + ": 值 " + value + " 大于契约 maximum " + max);
+        }
+    }
+
+    private static boolean enumMatches(List<Object> allowed, JsonNode node) {
+        if (node.isTextual()) {
+            return allowed.contains(node.asText());
+        }
+        if (node.isIntegralNumber()) {
+            long v = node.longValue();
+            return allowed.stream().anyMatch(a -> a instanceof Number n && n.longValue() == v);
+        }
+        return false;
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/contract/OpenApiContract.java

@@ -0,0 +1,151 @@
+package com.patbond.patbond.community.contract;
+
+import org.yaml.snakeyaml.Yaml;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.UncheckedIOException;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Locale;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+
+/**
+ * The frozen v1.4.0 OpenAPI contract, loaded from the test-resource snapshot
+ * {@code /contract/openapi-v1.4.0.yaml}.
+ *
+ * <p><b>Sync discipline (T2-09, extended by T3-19)</b>: the canonical
+ * contract lives in the doc repo at {@code docs/api/openapi.yaml}; this
+ * snapshot is a byte-identical copy taken at freeze time, and this class is
+ * the module-local copy of the pet module's contract framework (same
+ * per-module duplication discipline as BearerAuthFilter). Whenever the
+ * canonical contract changes, copy it into every framework-carrying module
+ * (patbond-pet / patbond-auth / patbond-community / patbond-user) under the
+ * new version's file name and update each conformance test (expected version
+ * + snapshot counts). The guard test on {@code info.version} makes a forgotten
+ * sync fail loudly in CI instead of silently testing against a stale
+ * contract.
+ *
+ * <p>Only the subset of OpenAPI 3.0 this contract actually uses is supported:
+ * local {@code #/} refs, plain types, {@code nullable}, {@code enum},
+ * {@code required}, {@code properties}, {@code items}, and the v1.3.0
+ * single-branch {@code nullable + allOf: [$ref]} pattern (merged in
+ * {@link ContractValidator}) — no oneOf/anyOf.
+ */
+final class OpenApiContract {
+
+    static final String RESOURCE = "/contract/openapi-v1.4.0.yaml";
+
+    private static final Set<String> HTTP_METHODS =
+            Set.of("get", "put", "post", "delete", "options", "head", "patch", "trace");
+
+    private final Map<String, Object> root;
+
+    private OpenApiContract(Map<String, Object> root) {
+        this.root = root;
+    }
+
+    static OpenApiContract load() {
+        try (InputStream in = Objects.requireNonNull(
+                OpenApiContract.class.getResourceAsStream(RESOURCE),
+                "契约快照缺失: " + RESOURCE)) {
+            return new OpenApiContract(new Yaml().load(in));
+        } catch (IOException e) {
+            throw new UncheckedIOException(e);
+        }
+    }
+
+    String version() {
+        return (String) map(root, "info").get("version");
+    }
+
+    Map<String, Object> paths() {
+        return map(root, "paths");
+    }
+
+    Map<String, Object> schemas() {
+        return map(map(root, "components"), "schemas");
+    }
+
+    /** All declared operations as "METHOD pathTemplate" (insertion order). */
+    Set<String> operations() {
+        Set<String> ops = new LinkedHashSet<>();
+        paths().forEach((path, item) -> cast(item).forEach((method, op) -> {
+            if (HTTP_METHODS.contains(method)) {
+                ops.add(method.toUpperCase(Locale.ROOT) + " " + path);
+            }
+        }));
+        return ops;
+    }
+
+    /** Operations whose first tag is in {@code tags}, as "METHOD pathTemplate". */
+    Set<String> operationsTagged(Set<String> tags) {
+        Set<String> ops = new LinkedHashSet<>();
+        for (String key : operations()) {
+            List<Object> opTags = list(operation(key), "tags");
+            if (opTags != null && opTags.stream().anyMatch(tags::contains)) {
+                ops.add(key);
+            }
+        }
+        return ops;
+    }
+
+    /** Declared response statuses of an operation, as ints. */
+    Set<Integer> responseStatuses(String operationKey) {
+        Set<Integer> statuses = new LinkedHashSet<>();
+        map(operation(operationKey), "responses")
+                .keySet().forEach(s -> statuses.add(Integer.parseInt(s)));
+        return statuses;
+    }
+
+    /** The single 2xx status the operation declares. */
+    int successStatus(String operationKey) {
+        return responseStatuses(operationKey).stream()
+                .filter(s -> s >= 200 && s < 300)
+                .reduce((a, b) -> {
+                    throw new IllegalStateException("多个 2xx 响应: " + operationKey);
+                })
+                .orElseThrow(() -> new IllegalStateException("无 2xx 响应: " + operationKey));
+    }
+
+    /** Operation object for "METHOD pathTemplate", or null when undeclared. */
+    Map<String, Object> operation(String operationKey) {
+        String[] parts = operationKey.split(" ", 2);
+        Map<String, Object> pathItem = map(paths(), parts[1]);
+        return pathItem == null ? null : map(pathItem, parts[0].toLowerCase(Locale.ROOT));
+    }
+
+    /** Follows local $ref chains; non-ref maps come back unchanged. */
+    Map<String, Object> resolve(Map<String, Object> node) {
+        while (node != null && node.get("$ref") instanceof String ref) {
+            if (!ref.startsWith("#/")) {
+                throw new IllegalStateException("仅支持本地 $ref: " + ref);
+            }
+            Map<String, Object> cur = root;
+            for (String seg : ref.substring(2).split("/")) {
+                cur = map(cur, seg);
+                if (cur == null) {
+                    throw new IllegalStateException("$ref 指向不存在的节点: " + ref);
+                }
+            }
+            node = cur;
+        }
+        return node;
+    }
+
+    @SuppressWarnings("unchecked")
+    static Map<String, Object> cast(Object o) {
+        return (Map<String, Object>) o;
+    }
+
+    static Map<String, Object> map(Map<String, Object> m, String key) {
+        return m == null ? null : cast(m.get(key));
+    }
+
+    @SuppressWarnings("unchecked")
+    static List<Object> list(Map<String, Object> m, String key) {
+        return m == null ? null : (List<Object>) m.get(key);
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/controller/HealthControllerTest.java

@@ -0,0 +1,36 @@
+package com.patbond.patbond.community.controller;
+
+import com.patbond.patbond.community.TestcontainersConfiguration;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.web.servlet.MockMvc;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * The liveness probe answers 200 with the standard envelope and reports the
+ * datasource as reachable (the Testcontainers database is up by definition).
+ * It sits outside /api/v1, so no token is needed.
+ */
+@SpringBootTest
+@AutoConfigureMockMvc
+@Import(TestcontainersConfiguration.class)
+class HealthControllerTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @Test
+    void healthReportsServiceAndDatabaseUp() throws Exception {
+        mockMvc.perform(get("/health"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.code").value(0))
+                .andExpect(jsonPath("$.data.status").value("ok"))
+                .andExpect(jsonPath("$.data.db").value("up"));
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/interaction/CommentIntegrationTest.java

@@ -0,0 +1,363 @@
+package com.patbond.patbond.community.interaction;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.patbond.patbond.community.post.PostApiTestBase;
+import com.patbond.patbond.community.support.CommunityTestData;
+import org.junit.jupiter.api.Test;
+import org.springframework.test.web.servlet.MvcResult;
+import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
+
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * T3-07 flat comments on the real database: the six canonical paths, the
+ * ADR-019 keyed-idempotency matrix, the interaction-surface 40403 merge,
+ * DESC keyset pagination and the same-transaction comment_count invariant.
+ * These assertions are T3-10 freeze input for the comment domain.
+ */
+class CommentIntegrationTest extends PostApiTestBase {
+
+    @Test
+    void createCommentReturnsFullShapeAndBumpsCount() throws Exception {
+        UUID author = newUser();
+        UUID commenter = newUser();
+        CommunityTestData.setNickname(jdbcClient, commenter, "毛豆妈");
+        String postId = publishPost(author);
+
+        mockMvc.perform(commentRequest(commenter, postId, UUID.randomUUID().toString(),
+                        "{\"content\": \"  说得好！  \"}"))
+                .andExpect(status().isCreated())
+                .andExpect(jsonPath("$.code").value(0))
+                .andExpect(jsonPath("$.data.id").isNotEmpty())
+                .andExpect(jsonPath("$.data.postId").value(postId))
+                .andExpect(jsonPath("$.data.author.userId").value(commenter.toString()))
+                .andExpect(jsonPath("$.data.author.nickname").value("毛豆妈"))
+                .andExpect(jsonPath("$.data.replyToUser").isEmpty())
+                .andExpect(jsonPath("$.data.content").value("说得好！"))
+                .andExpect(jsonPath("$.data.createdAt").isNotEmpty());
+
+        mockMvc.perform(authed(get("/api/v1/posts/" + postId), author))
+                .andExpect(jsonPath("$.data.commentCount").value(1));
+    }
+
+    @Test
+    void createWithReplyToUserCarriesReplySummary() throws Exception {
+        UUID author = newUser();
+        UUID replyTarget = newUser();
+        CommunityTestData.setNickname(jdbcClient, replyTarget, "被@的人");
+        String postId = publishPost(author);
+
+        mockMvc.perform(commentRequest(author, postId, UUID.randomUUID().toString(),
+                        "{\"content\": \"回复你\", \"replyToUserId\": \"" + replyTarget + "\"}"))
+                .andExpect(status().isCreated())
+                .andExpect(jsonPath("$.data.replyToUser.userId").value(replyTarget.toString()))
+                .andExpect(jsonPath("$.data.replyToUser.nickname").value("被@的人"));
+    }
+
+    @Test
+    void contentAndKeyValidationAnswer40000() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+
+        mockMvc.perform(commentRequest(user, postId, UUID.randomUUID().toString(),
+                        "{\"content\": \"   \"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(commentRequest(user, postId, UUID.randomUUID().toString(),
+                        "{\"content\": \"" + "长".repeat(2001) + "\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        // Idempotency-Key: missing header, blank, oversized
+        mockMvc.perform(authed(post("/api/v1/posts/" + postId + "/comments"), user)
+                        .content("{\"content\": \"没带键\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(commentRequest(user, postId, "   ", "{\"content\": \"空白键\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(commentRequest(user, postId, "k".repeat(129), "{\"content\": \"超长键\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void replyToAbsentOrDeletedUserAnswers40406() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        UUID ghost = UUID.randomUUID();
+        UUID cancelled = newUser();
+        jdbcClient.sql("UPDATE identity.users SET status = 'deleted', deleted_at = now()"
+                        + " WHERE id = :id")
+                .param("id", cancelled)
+                .update();
+
+        for (UUID target : List.of(ghost, cancelled)) {
+            mockMvc.perform(commentRequest(user, postId, UUID.randomUUID().toString(),
+                            "{\"content\": \"@不存在\", \"replyToUserId\": \"" + target + "\"}"))
+                    .andExpect(status().isNotFound())
+                    .andExpect(jsonPath("$.code").value(40406))
+                    .andExpect(jsonPath("$.message").value("用户不存在"));
+        }
+    }
+
+    @Test
+    void commentPathsOnInvisiblePostsAnswerIdentical40403() throws Exception {
+        UUID author = newUser();
+        UUID stranger = newUser();
+        String ownDraft = createPost(author, "{\"content\": \"草稿\"}").get("id").asText();
+        String hidden = publishPost(author);
+        jdbcClient.sql("UPDATE community.posts SET status = 'hidden' WHERE id = :id")
+                .param("id", UUID.fromString(hidden))
+                .update();
+        String deleted = publishPost(author);
+        mockMvc.perform(authed(delete("/api/v1/posts/" + deleted), author))
+                .andExpect(status().isOk());
+
+        Set<String> bodies = new LinkedHashSet<>();
+        // own draft (the interaction surface is the PUBLIC face — the
+        // author's own draft is not commentable), hidden, deleted, absent
+        for (String target : List.of(ownDraft, hidden, deleted, UUID.randomUUID().toString())) {
+            MvcResult postResult = mockMvc.perform(
+                            commentRequest(author, target, UUID.randomUUID().toString(),
+                                    "{\"content\": \"评一下\"}"))
+                    .andExpect(status().isNotFound())
+                    .andExpect(jsonPath("$.code").value(40403))
+                    .andReturn();
+            bodies.add(postResult.getResponse().getContentAsString());
+            MvcResult listResult = mockMvc.perform(
+                            authed(get("/api/v1/posts/" + target + "/comments"), stranger))
+                    .andExpect(status().isNotFound())
+                    .andExpect(jsonPath("$.code").value(40403))
+                    .andReturn();
+            bodies.add(listResult.getResponse().getContentAsString());
+        }
+        // anti-enumeration: every invisible case is byte-identical
+        assertThat(bodies).hasSize(1);
+    }
+
+    @Test
+    void keyedReplayReturnsFirstCommentWithoutDoubleCounting() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        String key = UUID.randomUUID().toString();
+
+        String first = data(mockMvc.perform(commentRequest(user, postId, key,
+                        "{\"content\": \"就一条\"}"))
+                .andExpect(status().isCreated())
+                .andReturn()).get("id").asText();
+        String replay = data(mockMvc.perform(commentRequest(user, postId, key,
+                        "{\"content\": \"就一条\"}"))
+                .andExpect(status().isCreated())
+                .andReturn()).get("id").asText();
+
+        assertThat(replay).isEqualTo(first);
+        assertThat(countRows("community.comments", "post_id", postId)).isEqualTo(1);
+        mockMvc.perform(authed(get("/api/v1/posts/" + postId), user))
+                .andExpect(jsonPath("$.data.commentCount").value(1));
+    }
+
+    @Test
+    void sameKeyDifferentPayloadAnswers40905() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        String key = UUID.randomUUID().toString();
+        mockMvc.perform(commentRequest(user, postId, key, "{\"content\": \"甲\"}"))
+                .andExpect(status().isCreated());
+        mockMvc.perform(commentRequest(user, postId, key, "{\"content\": \"乙\"}"))
+                .andExpect(status().isConflict())
+                .andExpect(jsonPath("$.code").value(40905));
+    }
+
+    @Test
+    void idempotencyKeysAreScopedPerAuthor() throws Exception {
+        UUID one = newUser();
+        UUID two = newUser();
+        String postId = publishPost(one);
+        String shared = UUID.randomUUID().toString();
+        mockMvc.perform(commentRequest(one, postId, shared, "{\"content\": \"同键\"}"))
+                .andExpect(status().isCreated());
+        mockMvc.perform(commentRequest(two, postId, shared, "{\"content\": \"同键\"}"))
+                .andExpect(status().isCreated());
+        assertThat(countRows("community.comments", "post_id", postId)).isEqualTo(2);
+    }
+
+    @Test
+    void replayAfterFirstCommentDeletedAnswers40404() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        String key = UUID.randomUUID().toString();
+        String commentId = data(mockMvc.perform(commentRequest(user, postId, key,
+                        "{\"content\": \"将被删\"}"))
+                .andReturn()).get("id").asText();
+        mockMvc.perform(authed(delete("/api/v1/comments/" + commentId), user))
+                .andExpect(status().isOk());
+
+        mockMvc.perform(commentRequest(user, postId, key, "{\"content\": \"将被删\"}"))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40404));
+    }
+
+    @Test
+    void listPagesNewestFirstWithoutLossOrOverlap() throws Exception {
+        UUID author = newUser();
+        UUID reader = newUser();
+        String postId = publishPost(author);
+        List<String> created = new ArrayList<>();
+        for (int i = 0; i < 7; i++) {
+            created.add(data(mockMvc.perform(commentRequest(author, postId,
+                            UUID.randomUUID().toString(), "{\"content\": \"评论" + i + "\"}"))
+                    .andReturn()).get("id").asText());
+        }
+        String deletedId = created.get(3);
+        mockMvc.perform(authed(delete("/api/v1/comments/" + deletedId), author))
+                .andExpect(status().isOk());
+
+        List<String> seen = new ArrayList<>();
+        String cursor = null;
+        for (int page = 0; page < 3; page++) {
+            String url = "/api/v1/posts/" + postId + "/comments?limit=3"
+                    + (cursor == null ? "" : "&cursor=" + cursor);
+            JsonNode body = data(mockMvc.perform(authed(get(url), reader))
+                    .andExpect(status().isOk())
+                    .andReturn());
+            body.get("items").forEach(item -> seen.add(item.get("id").asText()));
+            if (!body.get("hasMore").asBoolean()) {
+                assertThat(body.get("nextCursor").isNull()).isTrue();
+                break;
+            }
+            cursor = body.get("nextCursor").asText();
+        }
+        List<String> expected = new ArrayList<>(created);
+        java.util.Collections.reverse(expected);
+        expected.remove(deletedId);
+        assertThat(seen).containsExactlyElementsOf(expected);
+    }
+
+    @Test
+    void listRejectsBadPagingInput() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        mockMvc.perform(authed(get("/api/v1/posts/" + postId + "/comments?limit=0"), user))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(authed(get("/api/v1/posts/" + postId + "/comments?cursor=不是游标"), user))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(authed(get("/api/v1/posts/不是UUID/comments"), user))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void deleteWalksThePermissionBoundary() throws Exception {
+        UUID author = newUser();
+        UUID commenter = newUser();
+        UUID stranger = newUser();
+        String postId = publishPost(author);
+        String commentId = data(mockMvc.perform(commentRequest(commenter, postId,
+                        UUID.randomUUID().toString(), "{\"content\": \"别人的评论\"}"))
+                .andReturn()).get("id").asText();
+
+        // a visible comment deleted by a non-author (the post's owner
+        // included — D3-7: 帖主删他人评论首版不做) is 403/40301
+        mockMvc.perform(authed(delete("/api/v1/comments/" + commentId), stranger))
+                .andExpect(status().isForbidden())
+                .andExpect(jsonPath("$.code").value(40301));
+        mockMvc.perform(authed(delete("/api/v1/comments/" + commentId), author))
+                .andExpect(status().isForbidden())
+                .andExpect(jsonPath("$.code").value(40301));
+
+        mockMvc.perform(authed(delete("/api/v1/comments/" + commentId), commenter))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.code").value(0));
+        String state = jdbcClient.sql(
+                        "SELECT status || ':' || (deleted_at IS NOT NULL) FROM community.comments"
+                                + " WHERE id = :id")
+                .param("id", UUID.fromString(commentId))
+                .query(String.class)
+                .single();
+        assertThat(state).isEqualTo("deleted:true");
+
+        // repeat delete and absent id merge into 404/40404
+        mockMvc.perform(authed(delete("/api/v1/comments/" + commentId), commenter))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40404));
+        mockMvc.perform(authed(delete("/api/v1/comments/" + UUID.randomUUID()), commenter))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40404));
+    }
+
+    @Test
+    void deleteOnCommentOfDeletedPostAnswers40404() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        String commentId = data(mockMvc.perform(commentRequest(user, postId,
+                        UUID.randomUUID().toString(), "{\"content\": \"帖没了\"}"))
+                .andReturn()).get("id").asText();
+        mockMvc.perform(authed(delete("/api/v1/posts/" + postId), user))
+                .andExpect(status().isOk());
+
+        mockMvc.perform(authed(delete("/api/v1/comments/" + commentId), user))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40404));
+    }
+
+    @Test
+    void commentCountReconcilesWithVisibleRows() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        List<String> ids = new ArrayList<>();
+        for (int i = 0; i < 3; i++) {
+            ids.add(data(mockMvc.perform(commentRequest(user, postId,
+                            UUID.randomUUID().toString(), "{\"content\": \"第" + i + "条\"}"))
+                    .andReturn()).get("id").asText());
+        }
+        mockMvc.perform(authed(delete("/api/v1/comments/" + ids.get(0)), user))
+                .andExpect(status().isOk());
+
+        long column = jdbcClient.sql("SELECT comment_count FROM community.posts WHERE id = :id")
+                .param("id", UUID.fromString(postId))
+                .query(Long.class)
+                .single();
+        long visible = jdbcClient.sql("""
+                        SELECT count(*) FROM community.comments
+                        WHERE post_id = :id AND status = 'visible'
+                        """)
+                .param("id", UUID.fromString(postId))
+                .query(Long.class)
+                .single();
+        assertThat(column).isEqualTo(2).isEqualTo(visible);
+        mockMvc.perform(authed(get("/api/v1/posts/" + postId + "/comments"), user))
+                .andExpect(jsonPath("$.data.items.length()").value(2));
+    }
+
+    private String publishPost(UUID author) throws Exception {
+        return createPost(author, "{\"content\": \"被评论的帖子\", \"status\": \"published\"}")
+                .get("id").asText();
+    }
+
+    private MockHttpServletRequestBuilder commentRequest(UUID userId, String postId, String key,
+                                                         String body) {
+        return authed(post("/api/v1/posts/" + postId + "/comments"), userId)
+                .header("Idempotency-Key", key)
+                .content(body);
+    }
+
+    private long countRows(String table, String column, String value) {
+        return jdbcClient.sql("SELECT count(*) FROM " + table + " WHERE " + column + " = :value")
+                .param("value", UUID.fromString(value))
+                .query(Long.class)
+                .single();
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/interaction/FollowIntegrationTest.java

@@ -0,0 +1,156 @@
+package com.patbond.patbond.community.interaction;
+
+import com.patbond.patbond.community.post.PostApiTestBase;
+import org.junit.jupiter.api.Test;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * T3-07 minimal follow surface on the real database: idempotent
+ * follow/unfollow with authoritative state, the 42204 self-follow gate,
+ * the 40406 target gate (absent and 注销 merged), the numbers endpoint
+ * and true concurrent convergence on the composite primary key.
+ */
+class FollowIntegrationTest extends PostApiTestBase {
+
+    @Test
+    void followLifecycleIsIdempotentWithAuthoritativeState() throws Exception {
+        UUID follower = newUser();
+        UUID target = newUser();
+
+        mockMvc.perform(authed(put("/api/v1/users/" + target + "/follow"), follower))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.following").value(true))
+                .andExpect(jsonPath("$.data.followerCount").value(1));
+        mockMvc.perform(authed(put("/api/v1/users/" + target + "/follow"), follower))
+                .andExpect(jsonPath("$.data.following").value(true))
+                .andExpect(jsonPath("$.data.followerCount").value(1));
+
+        mockMvc.perform(authed(delete("/api/v1/users/" + target + "/follow"), follower))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.following").value(false))
+                .andExpect(jsonPath("$.data.followerCount").value(0));
+        mockMvc.perform(authed(delete("/api/v1/users/" + target + "/follow"), follower))
+                .andExpect(jsonPath("$.data.following").value(false))
+                .andExpect(jsonPath("$.data.followerCount").value(0));
+        assertThat(followRows(target)).isEqualTo(0);
+    }
+
+    @Test
+    void selfFollowIsRejectedWith42204() throws Exception {
+        UUID user = newUser();
+        mockMvc.perform(authed(put("/api/v1/users/" + user + "/follow"), user))
+                .andExpect(status().isUnprocessableEntity())
+                .andExpect(jsonPath("$.code").value(42204))
+                .andExpect(jsonPath("$.message").value("不能关注自己"));
+        // DELETE stays a plain idempotent no-op — the row cannot exist
+        mockMvc.perform(authed(delete("/api/v1/users/" + user + "/follow"), user))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.following").value(false));
+    }
+
+    @Test
+    void absentOrCancelledTargetAnswers40406OnEveryPath() throws Exception {
+        UUID caller = newUser();
+        UUID ghost = UUID.randomUUID();
+        UUID cancelled = newUser();
+        jdbcClient.sql("UPDATE identity.users SET status = 'deleted', deleted_at = now()"
+                        + " WHERE id = :id")
+                .param("id", cancelled)
+                .update();
+
+        for (UUID target : List.of(ghost, cancelled)) {
+            mockMvc.perform(authed(put("/api/v1/users/" + target + "/follow"), caller))
+                    .andExpect(status().isNotFound())
+                    .andExpect(jsonPath("$.code").value(40406));
+            mockMvc.perform(authed(delete("/api/v1/users/" + target + "/follow"), caller))
+                    .andExpect(status().isNotFound())
+                    .andExpect(jsonPath("$.code").value(40406));
+            mockMvc.perform(authed(get("/api/v1/users/" + target + "/follow-stats"), caller))
+                    .andExpect(status().isNotFound())
+                    .andExpect(jsonPath("$.code").value(40406));
+        }
+        mockMvc.perform(authed(put("/api/v1/users/不是UUID/follow"), caller))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void followStatsCountBothDirectionsWithViewerFlag() throws Exception {
+        UUID alice = newUser();
+        UUID bob = newUser();
+        UUID carol = newUser();
+        // alice→bob, carol→bob, bob→alice
+        mockMvc.perform(authed(put("/api/v1/users/" + bob + "/follow"), alice))
+                .andExpect(status().isOk());
+        mockMvc.perform(authed(put("/api/v1/users/" + bob + "/follow"), carol))
+                .andExpect(status().isOk());
+        mockMvc.perform(authed(put("/api/v1/users/" + alice + "/follow"), bob))
+                .andExpect(status().isOk());
+
+        mockMvc.perform(authed(get("/api/v1/users/" + bob + "/follow-stats"), alice))
+                .andExpect(jsonPath("$.data.followerCount").value(2))
+                .andExpect(jsonPath("$.data.followingCount").value(1))
+                .andExpect(jsonPath("$.data.followedByMe").value(true));
+        mockMvc.perform(authed(get("/api/v1/users/" + alice + "/follow-stats"), carol))
+                .andExpect(jsonPath("$.data.followerCount").value(1))
+                .andExpect(jsonPath("$.data.followingCount").value(1))
+                .andExpect(jsonPath("$.data.followedByMe").value(false));
+        // asking about oneself: followedByMe is definitionally false
+        mockMvc.perform(authed(get("/api/v1/users/" + bob + "/follow-stats"), bob))
+                .andExpect(jsonPath("$.data.followerCount").value(2))
+                .andExpect(jsonPath("$.data.followedByMe").value(false));
+    }
+
+    @Test
+    void concurrentDuplicateFollowsLandExactlyOneRow() throws Exception {
+        UUID follower = newUser();
+        UUID target = newUser();
+        CountDownLatch start = new CountDownLatch(1);
+        ExecutorService pool = Executors.newFixedThreadPool(3);
+        try {
+            List<Future<Integer>> results = new ArrayList<>();
+            for (int i = 0; i < 3; i++) {
+                results.add(pool.submit(() -> {
+                    start.await();
+                    return mockMvc.perform(
+                                    authed(put("/api/v1/users/" + target + "/follow"), follower))
+                            .andReturn().getResponse().getStatus();
+                }));
+            }
+            start.countDown();
+            for (Future<Integer> result : results) {
+                assertThat(result.get(30, TimeUnit.SECONDS)).isEqualTo(200);
+            }
+        } finally {
+            pool.shutdownNow();
+        }
+        assertThat(followRows(target)).isEqualTo(1);
+        mockMvc.perform(authed(get("/api/v1/users/" + target + "/follow-stats"), follower))
+                .andExpect(jsonPath("$.data.followerCount").value(1));
+    }
+
+    private long followRows(UUID followee) {
+        return jdbcClient.sql("""
+                        SELECT count(*) FROM community.user_follows
+                        WHERE followee_user_id = :id
+                        """)
+                .param("id", followee)
+                .query(Long.class)
+                .single();
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/interaction/LikeBookmarkIntegrationTest.java

@@ -0,0 +1,295 @@
+package com.patbond.patbond.community.interaction;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.patbond.patbond.community.post.PostApiTestBase;
+import org.junit.jupiter.api.Test;
+import org.springframework.test.web.servlet.MvcResult;
+
+import java.util.ArrayList;
+import java.util.LinkedHashSet;
+import java.util.List;
+import java.util.Set;
+import java.util.UUID;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * T3-06 idempotent like/bookmark on the real database: the authoritative
+ * terminal-state responses, TRUE concurrent convergence on the composite
+ * primary key (the M3 acceptance criterion: N concurrent PUTs count
+ * exactly 1), the 40403 interaction gate, the my-bookmarks keyset list
+ * with silent removal, and column-vs-relation reconciliation.
+ */
+class LikeBookmarkIntegrationTest extends PostApiTestBase {
+
+    @Test
+    void likeLifecycleIsIdempotentWithAuthoritativeState() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+
+        mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/like"), user))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.liked").value(true))
+                .andExpect(jsonPath("$.data.likeCount").value(1));
+        mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/like"), user))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.liked").value(true))
+                .andExpect(jsonPath("$.data.likeCount").value(1));
+        assertThat(likeRows(postId)).isEqualTo(1);
+
+        mockMvc.perform(authed(delete("/api/v1/posts/" + postId + "/like"), user))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.liked").value(false))
+                .andExpect(jsonPath("$.data.likeCount").value(0));
+        // cancelling a like that does not exist neither errors nor
+        // decrements (工单验收)
+        mockMvc.perform(authed(delete("/api/v1/posts/" + postId + "/like"), user))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.liked").value(false))
+                .andExpect(jsonPath("$.data.likeCount").value(0));
+        assertThat(likeRows(postId)).isEqualTo(0);
+    }
+
+    @Test
+    void bookmarkLifecycleIsIdempotentWithAuthoritativeState() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+
+        mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/bookmark"), user))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.bookmarked").value(true))
+                .andExpect(jsonPath("$.data.bookmarkCount").value(1));
+        mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/bookmark"), user))
+                .andExpect(jsonPath("$.data.bookmarkCount").value(1));
+        mockMvc.perform(authed(delete("/api/v1/posts/" + postId + "/bookmark"), user))
+                .andExpect(jsonPath("$.data.bookmarked").value(false))
+                .andExpect(jsonPath("$.data.bookmarkCount").value(0));
+        mockMvc.perform(authed(delete("/api/v1/posts/" + postId + "/bookmark"), user))
+                .andExpect(jsonPath("$.data.bookmarkCount").value(0));
+    }
+
+    @Test
+    void distinctUsersAccumulateAndSurfaceInDetail() throws Exception {
+        UUID author = newUser();
+        UUID other = newUser();
+        String postId = publishPost(author);
+
+        mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/like"), author))
+                .andExpect(jsonPath("$.data.likeCount").value(1));
+        mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/like"), other))
+                .andExpect(jsonPath("$.data.likeCount").value(2));
+        mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/bookmark"), other))
+                .andExpect(jsonPath("$.data.bookmarkCount").value(1));
+
+        mockMvc.perform(authed(get("/api/v1/posts/" + postId), other))
+                .andExpect(jsonPath("$.data.likeCount").value(2))
+                .andExpect(jsonPath("$.data.bookmarkCount").value(1))
+                .andExpect(jsonPath("$.data.likedByMe").value(true))
+                .andExpect(jsonPath("$.data.bookmarkedByMe").value(true));
+        mockMvc.perform(authed(get("/api/v1/posts/" + postId), author))
+                .andExpect(jsonPath("$.data.likedByMe").value(true))
+                .andExpect(jsonPath("$.data.bookmarkedByMe").value(false));
+    }
+
+    @Test
+    void interactionsOnInvisiblePostsAnswerIdentical40403() throws Exception {
+        UUID author = newUser();
+        String ownDraft = createPost(author, "{\"content\": \"草稿\"}").get("id").asText();
+        String hidden = publishPost(author);
+        jdbcClient.sql("UPDATE community.posts SET status = 'hidden' WHERE id = :id")
+                .param("id", UUID.fromString(hidden))
+                .update();
+        String deleted = publishPost(author);
+        mockMvc.perform(authed(delete("/api/v1/posts/" + deleted), author))
+                .andExpect(status().isOk());
+
+        Set<String> bodies = new LinkedHashSet<>();
+        for (String target : List.of(ownDraft, hidden, deleted, UUID.randomUUID().toString())) {
+            for (String action : List.of("like", "bookmark")) {
+                MvcResult puts = mockMvc.perform(
+                                authed(put("/api/v1/posts/" + target + "/" + action), author))
+                        .andExpect(status().isNotFound())
+                        .andExpect(jsonPath("$.code").value(40403))
+                        .andReturn();
+                MvcResult deletes = mockMvc.perform(
+                                authed(delete("/api/v1/posts/" + target + "/" + action), author))
+                        .andExpect(status().isNotFound())
+                        .andExpect(jsonPath("$.code").value(40403))
+                        .andReturn();
+                bodies.add(puts.getResponse().getContentAsString());
+                bodies.add(deletes.getResponse().getContentAsString());
+            }
+        }
+        assertThat(bodies).hasSize(1);
+    }
+
+    @Test
+    void concurrentDuplicatePutsCountExactlyOne() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        CountDownLatch start = new CountDownLatch(1);
+        ExecutorService pool = Executors.newFixedThreadPool(4);
+        try {
+            List<Future<Integer>> results = new ArrayList<>();
+            for (int i = 0; i < 4; i++) {
+                results.add(pool.submit(() -> {
+                    start.await();
+                    return mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/like"), user))
+                            .andReturn().getResponse().getStatus();
+                }));
+            }
+            start.countDown();
+            for (Future<Integer> result : results) {
+                assertThat(result.get(30, TimeUnit.SECONDS)).isEqualTo(200);
+            }
+        } finally {
+            pool.shutdownNow();
+        }
+        assertThat(likeRows(postId)).isEqualTo(1);
+        assertThat(likeColumn(postId)).isEqualTo(1);
+    }
+
+    @Test
+    void concurrentPutAndDeleteConvergeOnConsistentTerminalState() throws Exception {
+        UUID user = newUser();
+        String postId = publishPost(user);
+        CountDownLatch start = new CountDownLatch(1);
+        ExecutorService pool = Executors.newFixedThreadPool(2);
+        try {
+            Future<Integer> putting = pool.submit(() -> {
+                start.await();
+                return mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/like"), user))
+                        .andReturn().getResponse().getStatus();
+            });
+            Future<Integer> deleting = pool.submit(() -> {
+                start.await();
+                return mockMvc.perform(authed(delete("/api/v1/posts/" + postId + "/like"), user))
+                        .andReturn().getResponse().getStatus();
+            });
+            start.countDown();
+            assertThat(putting.get(30, TimeUnit.SECONDS)).isEqualTo(200);
+            assertThat(deleting.get(30, TimeUnit.SECONDS)).isEqualTo(200);
+        } finally {
+            pool.shutdownNow();
+        }
+        // whichever order the race resolved in, the column agrees with the
+        // relation table — never a phantom count
+        assertThat(likeColumn(postId)).isEqualTo(likeRows(postId));
+    }
+
+    @Test
+    void countColumnsReconcileWithRelationRowsAfterMixedOps() throws Exception {
+        UUID author = newUser();
+        UUID second = newUser();
+        UUID third = newUser();
+        String postId = publishPost(author);
+        for (UUID user : List.of(author, second, third)) {
+            mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/like"), user))
+                    .andExpect(status().isOk());
+            mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/bookmark"), user))
+                    .andExpect(status().isOk());
+        }
+        mockMvc.perform(authed(delete("/api/v1/posts/" + postId + "/like"), second))
+                .andExpect(status().isOk());
+        mockMvc.perform(authed(delete("/api/v1/posts/" + postId + "/bookmark"), third))
+                .andExpect(status().isOk());
+
+        assertThat(likeColumn(postId)).isEqualTo(2).isEqualTo(likeRows(postId));
+        long bookmarkColumn = jdbcClient.sql(
+                        "SELECT bookmark_count FROM community.posts WHERE id = :id")
+                .param("id", UUID.fromString(postId))
+                .query(Long.class)
+                .single();
+        long bookmarkRows = jdbcClient.sql(
+                        "SELECT count(*) FROM community.post_bookmarks WHERE post_id = :id")
+                .param("id", UUID.fromString(postId))
+                .query(Long.class)
+                .single();
+        assertThat(bookmarkColumn).isEqualTo(2).isEqualTo(bookmarkRows);
+    }
+
+    @Test
+    void myBookmarksPagesByBookmarkTimeAndDropsInvisible() throws Exception {
+        UUID author = newUser();
+        UUID reader = newUser();
+        List<String> posts = new ArrayList<>();
+        for (int i = 0; i < 5; i++) {
+            posts.add(publishPost(author));
+        }
+        for (String postId : posts) {
+            mockMvc.perform(authed(put("/api/v1/posts/" + postId + "/bookmark"), reader))
+                    .andExpect(status().isOk());
+        }
+        // one bookmarked post soft-deleted, one hidden → silently dropped
+        mockMvc.perform(authed(delete("/api/v1/posts/" + posts.get(1)), author))
+                .andExpect(status().isOk());
+        jdbcClient.sql("UPDATE community.posts SET status = 'hidden' WHERE id = :id")
+                .param("id", UUID.fromString(posts.get(3)))
+                .update();
+
+        List<String> seen = new ArrayList<>();
+        String cursor = null;
+        for (int page = 0; page < 3; page++) {
+            String url = "/api/v1/me/bookmarks?limit=2"
+                    + (cursor == null ? "" : "&cursor=" + cursor);
+            JsonNode body = data(mockMvc.perform(authed(get(url), reader))
+                    .andExpect(status().isOk())
+                    .andReturn());
+            for (JsonNode item : body.get("items")) {
+                seen.add(item.get("id").asText());
+                // the item IS the feed card: cover-less text post, counts,
+                // viewer flags, non-null publishedAt
+                assertThat(item.get("bookmarkedByMe").asBoolean()).isTrue();
+                assertThat(item.get("publishedAt").isNull()).isFalse();
+                assertThat(item.has("contentPreview")).isTrue();
+                assertThat(item.has("content")).isFalse();
+            }
+            if (!body.get("hasMore").asBoolean()) {
+                break;
+            }
+            cursor = body.get("nextCursor").asText();
+        }
+        // bookmark order DESC (posts were bookmarked 0→4), invisible dropped
+        assertThat(seen).containsExactly(posts.get(4), posts.get(2), posts.get(0));
+    }
+
+    @Test
+    void myBookmarksRejectsBadPagingInput() throws Exception {
+        UUID user = newUser();
+        mockMvc.perform(authed(get("/api/v1/me/bookmarks?limit=101"), user))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(authed(get("/api/v1/me/bookmarks?cursor=损坏"), user))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    private String publishPost(UUID author) throws Exception {
+        return createPost(author, "{\"content\": \"被互动的帖子\", \"status\": \"published\"}")
+                .get("id").asText();
+    }
+
+    private long likeRows(String postId) {
+        return jdbcClient.sql("SELECT count(*) FROM community.post_likes WHERE post_id = :id")
+                .param("id", UUID.fromString(postId))
+                .query(Long.class)
+                .single();
+    }
+
+    private long likeColumn(String postId) {
+        return jdbcClient.sql("SELECT like_count FROM community.posts WHERE id = :id")
+                .param("id", UUID.fromString(postId))
+                .query(Long.class)
+                .single();
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/post/AuthorProfileIntegrationTest.java

@@ -0,0 +1,150 @@
+package com.patbond.patbond.community.post;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.patbond.patbond.community.support.CommunityTestData;
+import com.patbond.patbond.community.support.StubAuthorProfileClient;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.test.web.servlet.MvcResult;
+
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * AuthorSummary 定型 (D3-9 方案 B / T3-05): the detail response's author
+ * backfill (closes T3-04 contract deviation #1), the server-side
+ * nickname→username fallback, avatar URL signing, the short-TTL cache and
+ * the degrade-don't-5xx semantics when the user service is unreachable.
+ * The Feign transport itself is covered by AuthorProfileClientWireTest.
+ */
+class AuthorProfileIntegrationTest extends PostApiTestBase {
+
+    @Autowired
+    private StubAuthorProfileClient stubClient;
+
+    @AfterEach
+    void restoreUserService() {
+        stubClient.setUnavailable(false);
+    }
+
+    private JsonNode detail(UUID viewer, String postId) throws Exception {
+        MvcResult result = mockMvc.perform(authed(get("/api/v1/posts/" + postId), viewer))
+                .andExpect(status().isOk())
+                .andReturn();
+        return data(result);
+    }
+
+    @Test
+    void detailBackfillsTheAuthorSummaryWithTheNickname() throws Exception {
+        UUID author = newUser();
+        CommunityTestData.setNickname(jdbcClient, author, "毛毛的铲屎官");
+        JsonNode post = createPost(author, "{\"content\": \"作者摘要\", \"status\": \"published\"}");
+
+        JsonNode summary = detail(newUser(), post.get("id").asText()).get("author");
+        assertThat(summary.get("userId").asText()).isEqualTo(author.toString());
+        assertThat(summary.get("nickname").asText()).isEqualTo("毛毛的铲屎官");
+        assertThat(summary.get("avatarUrl").isNull()).isTrue();
+    }
+
+    @Test
+    void nicknameFallsBackToUsernameServerSide() throws Exception {
+        UUID author = newUser();
+        String username = jdbcClient.sql("SELECT username::text FROM identity.users WHERE id = :id")
+                .param("id", author)
+                .query(String.class)
+                .single();
+        JsonNode post = createPost(author, "{\"content\": \"回退昵称\", \"status\": \"published\"}");
+
+        JsonNode summary = detail(newUser(), post.get("id").asText()).get("author");
+        assertThat(summary.get("nickname").asText()).isEqualTo(username);
+    }
+
+    @Test
+    void readyAvatarBecomesASignedUrlAndUnreadyStaysNull() throws Exception {
+        UUID withReady = newUser();
+        UUID readyAsset = CommunityTestData.attachAvatar(jdbcClient, withReady, "ready");
+        UUID withUploading = newUser();
+        CommunityTestData.attachAvatar(jdbcClient, withUploading, "uploading");
+        JsonNode readyPost = createPost(withReady, "{\"content\": \"有头像\", \"status\": \"published\"}");
+        JsonNode uploadingPost = createPost(withUploading, "{\"content\": \"头像未就绪\", \"status\": \"published\"}");
+
+        UUID viewer = newUser();
+        JsonNode readySummary = detail(viewer, readyPost.get("id").asText()).get("author");
+        assertThat(readySummary.get("avatarUrl").asText())
+                .contains(readyAsset.toString())
+                .contains("X-Amz-Signature");
+        JsonNode uploadingSummary = detail(viewer, uploadingPost.get("id").asText()).get("author");
+        assertThat(uploadingSummary.get("avatarUrl").isNull()).isTrue();
+    }
+
+    @Test
+    void secondLookupWithinTheTtlIsServedFromTheCache() throws Exception {
+        UUID author = newUser();
+        UUID postId = CommunityTestData.insertPublishedPost(jdbcClient, author, "缓存命中");
+        UUID viewer = newUser();
+
+        int before = stubClient.invocationCount();
+        detail(viewer, postId.toString());
+        int afterFirst = stubClient.invocationCount();
+        detail(viewer, postId.toString());
+        int afterSecond = stubClient.invocationCount();
+
+        assertThat(afterFirst - before).isEqualTo(1);
+        assertThat(afterSecond - afterFirst).isZero();
+    }
+
+    @Test
+    void unreachableUserServiceDegradesToIdOnlyInsteadOf5xx() throws Exception {
+        UUID author = newUser();
+        CommunityTestData.setNickname(jdbcClient, author, "看不见的昵称");
+        UUID postId = CommunityTestData.insertPublishedPost(jdbcClient, author, "降级帖");
+
+        stubClient.setUnavailable(true);
+        JsonNode summary = detail(newUser(), postId.toString()).get("author");
+        assertThat(summary.get("userId").asText()).isEqualTo(author.toString());
+        assertThat(summary.get("nickname").isNull()).isTrue();
+        assertThat(summary.get("avatarUrl").isNull()).isTrue();
+    }
+
+    @Test
+    void degradedFeedStillServesEveryCard() throws Exception {
+        UUID author = newUser();
+        UUID postId = CommunityTestData.insertPublishedPost(jdbcClient, author, "降级 Feed");
+
+        stubClient.setUnavailable(true);
+        MvcResult result = mockMvc.perform(
+                        authed(get("/api/v1/feed").queryParam("limit", "100"), newUser()))
+                .andExpect(status().isOk())
+                .andReturn();
+        JsonNode items = data(result).get("items");
+        JsonNode card = null;
+        for (JsonNode item : items) {
+            if (item.get("id").asText().equals(postId.toString())) {
+                card = item;
+            }
+        }
+        assertThat(card).isNotNull();
+        assertThat(card.get("author").get("userId").asText()).isEqualTo(author.toString());
+        assertThat(card.get("author").get("nickname").isNull()).isTrue();
+    }
+
+    @Test
+    void aFailedLookupIsNotCachedSoTheNextRequestRecovers() throws Exception {
+        UUID author = newUser();
+        CommunityTestData.setNickname(jdbcClient, author, "恢复后的昵称");
+        UUID postId = CommunityTestData.insertPublishedPost(jdbcClient, author, "降级不缓存");
+        UUID viewer = newUser();
+
+        stubClient.setUnavailable(true);
+        JsonNode degraded = detail(viewer, postId.toString()).get("author");
+        assertThat(degraded.get("nickname").isNull()).isTrue();
+
+        stubClient.setUnavailable(false);
+        JsonNode recovered = detail(viewer, postId.toString()).get("author");
+        assertThat(recovered.get("nickname").asText()).isEqualTo("恢复后的昵称");
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/post/FeedCardIntegrationTest.java

@@ -0,0 +1,133 @@
+package com.patbond.patbond.community.post;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.patbond.patbond.community.support.CommunityTestData;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.test.web.servlet.MvcResult;
+
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * Feed card field 定型 (T3-05, the FeedCard freeze input): the 200-code-point
+ * preview rule, cover selection from the unique is_cover row, mediaCount,
+ * counts read from the posts table's denormalized columns, and the
+ * viewer-relative flags.
+ */
+class FeedCardIntegrationTest extends PostApiTestBase {
+
+    private UUID viewer;
+
+    @BeforeEach
+    void wipeFeed() {
+        jdbcClient.sql("DELETE FROM community.posts").update();
+        viewer = newUser();
+    }
+
+    private JsonNode firstCard() throws Exception {
+        MvcResult result = mockMvc.perform(authed(get("/api/v1/feed"), viewer))
+                .andExpect(status().isOk())
+                .andReturn();
+        JsonNode items = data(result).get("items");
+        assertThat(items).hasSize(1);
+        return items.get(0);
+    }
+
+    @Test
+    void cardCarriesTheFrozenFieldSetForATextOnlyPost() throws Exception {
+        UUID author = newUser();
+        JsonNode post = createPost(author, """
+                {"title": "卡片字段", "content": "纯文字帖", "category": "help",
+                 "status": "published"}
+                """);
+
+        JsonNode card = firstCard();
+        assertThat(card.get("id").asText()).isEqualTo(post.get("id").asText());
+        assertThat(card.get("author").get("userId").asText()).isEqualTo(author.toString());
+        assertThat(card.get("category").asText()).isEqualTo("help");
+        assertThat(card.get("title").asText()).isEqualTo("卡片字段");
+        assertThat(card.get("contentPreview").asText()).isEqualTo("纯文字帖");
+        assertThat(card.get("coverImage").isNull()).isTrue();
+        assertThat(card.get("mediaCount").asInt()).isZero();
+        assertThat(card.get("likeCount").asLong()).isZero();
+        assertThat(card.get("commentCount").asLong()).isZero();
+        assertThat(card.get("bookmarkCount").asLong()).isZero();
+        assertThat(card.get("likedByMe").asBoolean()).isFalse();
+        assertThat(card.get("bookmarkedByMe").asBoolean()).isFalse();
+        assertThat(card.get("publishedAt").asText()).contains("T");
+        // Trimmed relative to Post: no full content, no version, no visibility.
+        assertThat(card.has("content")).isFalse();
+        assertThat(card.has("version")).isFalse();
+    }
+
+    @Test
+    void previewCutsAtTwoHundredCodePointsWithoutSplittingSurrogates() throws Exception {
+        UUID author = newUser();
+        String content = "汉".repeat(199) + "🐱" + "这些字符必须被截掉";
+        createPost(author,
+                "{\"content\": \"%s\", \"status\": \"published\"}".formatted(content));
+
+        String preview = firstCard().get("contentPreview").asText();
+        assertThat(preview.codePointCount(0, preview.length())).isEqualTo(200);
+        assertThat(preview).isEqualTo("汉".repeat(199) + "🐱");
+    }
+
+    @Test
+    void shortContentIsPassedThroughVerbatim() throws Exception {
+        UUID author = newUser();
+        createPost(author, "{\"content\": \"刚好不截断\", \"status\": \"published\"}");
+        assertThat(firstCard().get("contentPreview").asText()).isEqualTo("刚好不截断");
+    }
+
+    @Test
+    void coverIsTheIsCoverRowAndMediaCountTheWholeSet() throws Exception {
+        UUID author = newUser();
+        UUID assetA = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        UUID assetB = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        createPost(author, """
+                {"content": "两图帖", "status": "published",
+                 "media": [{"assetId": "%s"}, {"assetId": "%s", "isCover": true}]}
+                """.formatted(assetA, assetB));
+
+        JsonNode card = firstCard();
+        assertThat(card.get("mediaCount").asInt()).isEqualTo(2);
+        JsonNode cover = card.get("coverImage");
+        assertThat(cover.get("assetId").asText()).isEqualTo(assetB.toString());
+        assertThat(cover.get("isCover").asBoolean()).isTrue();
+        assertThat(cover.get("url").asText())
+                .contains(assetB.toString())
+                .contains("X-Amz-Signature");
+    }
+
+    @Test
+    void countsComeFromTheDenormalizedColumnsAndFlagsFromTheRelationTables() throws Exception {
+        UUID author = newUser();
+        JsonNode post = createPost(author, "{\"content\": \"计数帖\", \"status\": \"published\"}");
+        UUID postId = UUID.fromString(post.get("id").asText());
+        jdbcClient.sql("""
+                        UPDATE community.posts
+                        SET like_count = 5, comment_count = 3, bookmark_count = 2
+                        WHERE id = :id
+                        """)
+                .param("id", postId)
+                .update();
+        jdbcClient.sql("""
+                        INSERT INTO community.post_likes (post_id, user_id)
+                        VALUES (:postId, :userId)
+                        """)
+                .param("postId", postId)
+                .param("userId", viewer)
+                .update();
+
+        JsonNode card = firstCard();
+        assertThat(card.get("likeCount").asLong()).isEqualTo(5);
+        assertThat(card.get("commentCount").asLong()).isEqualTo(3);
+        assertThat(card.get("bookmarkCount").asLong()).isEqualTo(2);
+        assertThat(card.get("likedByMe").asBoolean()).isTrue();
+        assertThat(card.get("bookmarkedByMe").asBoolean()).isFalse();
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/post/FeedPaginationIntegrationTest.java

@@ -0,0 +1,207 @@
+package com.patbond.patbond.community.post;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+import org.springframework.test.web.servlet.MvcResult;
+import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
+
+import java.time.OffsetDateTime;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * Feed pagination 专项 (T3-05 工单要求): empty feed, single page, page
+ * walking with no loss and no duplication (including published_at ties and
+ * inserts/deletes between page fetches), cursor validity, and the
+ * visibility predicate. The feed is global state, so every test starts
+ * from a wiped community.posts (the FK cascades clear media/likes/
+ * bookmarks); other test classes create their own rows per test and run
+ * sequentially, so the wipe races nothing.
+ */
+class FeedPaginationIntegrationTest extends PostApiTestBase {
+
+    private UUID viewer;
+
+    @BeforeEach
+    void wipeFeed() {
+        jdbcClient.sql("DELETE FROM community.posts").update();
+        viewer = newUser();
+    }
+
+    private MockHttpServletRequestBuilder feed(UUID userId, Integer limit, String cursor) {
+        MockHttpServletRequestBuilder builder = authed(get("/api/v1/feed"), userId);
+        if (limit != null) {
+            builder = builder.queryParam("limit", String.valueOf(limit));
+        }
+        if (cursor != null) {
+            builder = builder.queryParam("cursor", cursor);
+        }
+        return builder;
+    }
+
+    private JsonNode feedPage(UUID userId, Integer limit, String cursor) throws Exception {
+        MvcResult result = mockMvc.perform(feed(userId, limit, cursor))
+                .andExpect(status().isOk())
+                .andReturn();
+        return data(result);
+    }
+
+    private UUID publish(UUID author, String content) throws Exception {
+        JsonNode post = createPost(author,
+                "{\"content\": \"%s\", \"status\": \"published\"}".formatted(content));
+        return UUID.fromString(post.get("id").asText());
+    }
+
+    private List<String> idsOf(JsonNode page) {
+        List<String> ids = new ArrayList<>();
+        page.get("items").forEach(item -> ids.add(item.get("id").asText()));
+        return ids;
+    }
+
+    @Test
+    void emptyFeedIsAnEmptyPage() throws Exception {
+        JsonNode page = feedPage(viewer, null, null);
+        assertThat(page.get("items")).isEmpty();
+        assertThat(page.get("hasMore").asBoolean()).isFalse();
+        assertThat(page.get("nextCursor").isNull()).isTrue();
+    }
+
+    @Test
+    void singlePageListsNewestFirstWithoutACursor() throws Exception {
+        UUID author = newUser();
+        UUID first = publish(author, "一号帖");
+        UUID second = publish(author, "二号帖");
+
+        JsonNode page = feedPage(viewer, null, null);
+        assertThat(idsOf(page)).containsExactly(second.toString(), first.toString());
+        assertThat(page.get("hasMore").asBoolean()).isFalse();
+        assertThat(page.get("nextCursor").isNull()).isTrue();
+    }
+
+    @Test
+    void onlyLivePublishedPublicPostsAppear() throws Exception {
+        UUID author = newUser();
+        UUID visible = publish(author, "可见的帖子");
+        createPost(author, "{\"content\": \"草稿不进 Feed\"}");
+        UUID deleted = publish(author, "删除后不进 Feed");
+        mockMvc.perform(authed(delete("/api/v1/posts/" + deleted), author))
+                .andExpect(status().isOk());
+        UUID hidden = publish(author, "hidden 不进 Feed");
+        jdbcClient.sql("UPDATE community.posts SET status = 'hidden' WHERE id = :id")
+                .param("id", hidden)
+                .update();
+        UUID nonPublic = publish(author, "followers 可见性不进 Feed");
+        jdbcClient.sql("UPDATE community.posts SET visibility = 'followers' WHERE id = :id")
+                .param("id", nonPublic)
+                .update();
+
+        JsonNode page = feedPage(viewer, null, null);
+        assertThat(idsOf(page)).containsExactly(visible.toString());
+    }
+
+    @Test
+    void pageWalkLosesNothingAndRepeatsNothing() throws Exception {
+        UUID author = newUser();
+        List<String> published = new ArrayList<>();
+        for (int i = 0; i < 7; i++) {
+            published.add(publish(author, "翻页帖 " + i).toString());
+        }
+        List<String> expected = new ArrayList<>(published);
+        java.util.Collections.reverse(expected);
+
+        List<String> crawled = new ArrayList<>();
+        String cursor = null;
+        int pages = 0;
+        while (true) {
+            JsonNode page = feedPage(viewer, 3, cursor);
+            crawled.addAll(idsOf(page));
+            pages++;
+            if (!page.get("hasMore").asBoolean()) {
+                assertThat(page.get("nextCursor").isNull()).isTrue();
+                break;
+            }
+            cursor = page.get("nextCursor").asText();
+        }
+        assertThat(pages).isEqualTo(3);
+        assertThat(crawled).containsExactlyElementsOf(expected);
+    }
+
+    @Test
+    void publishedAtTiesAreBrokenByIdWithoutLossOrDuplication() throws Exception {
+        UUID author = newUser();
+        List<UUID> ids = new ArrayList<>();
+        for (int i = 0; i < 3; i++) {
+            ids.add(publish(author, "同刻帖 " + i));
+        }
+        OffsetDateTime sameInstant = OffsetDateTime.now();
+        for (UUID id : ids) {
+            jdbcClient.sql("UPDATE community.posts SET published_at = :ts WHERE id = :id")
+                    .param("ts", sameInstant)
+                    .param("id", id)
+                    .update();
+        }
+        List<String> expected = ids.stream()
+                .map(UUID::toString)
+                .sorted(java.util.Comparator.reverseOrder())
+                .toList();
+
+        JsonNode page1 = feedPage(viewer, 2, null);
+        JsonNode page2 = feedPage(viewer, 2, page1.get("nextCursor").asText());
+        List<String> crawled = new ArrayList<>(idsOf(page1));
+        crawled.addAll(idsOf(page2));
+        assertThat(crawled).containsExactlyElementsOf(expected);
+        assertThat(page2.get("hasMore").asBoolean()).isFalse();
+    }
+
+    @Test
+    void insertsAndDeletesBetweenPagesNeitherShiftNorRepeat() throws Exception {
+        UUID author = newUser();
+        List<UUID> ids = new ArrayList<>();
+        for (int i = 0; i < 5; i++) {
+            ids.add(publish(author, "间隙帖 " + i));
+        }
+        // Oldest→newest is ids[0..4]; page 1 (limit 2) shows ids[4], ids[3].
+        JsonNode page1 = feedPage(viewer, 2, null);
+        assertThat(idsOf(page1)).containsExactly(ids.get(4).toString(), ids.get(3).toString());
+
+        // Between the fetches: a new post lands (newer than the cursor — must
+        // NOT shift page 2) and one page-2 candidate is deleted (must vanish
+        // without repeating anything).
+        publish(author, "翻页间隙新发布");
+        mockMvc.perform(authed(delete("/api/v1/posts/" + ids.get(2)), author))
+                .andExpect(status().isOk());
+
+        JsonNode page2 = feedPage(viewer, 2, page1.get("nextCursor").asText());
+        assertThat(idsOf(page2)).containsExactly(ids.get(1).toString(), ids.get(0).toString());
+        assertThat(page2.get("hasMore").asBoolean()).isFalse();
+    }
+
+    @Test
+    void invalidCursorsAreA400() throws Exception {
+        mockMvc.perform(feed(viewer, null, "not-base64url!!"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(feed(viewer, null,
+                java.util.Base64.getUrlEncoder().encodeToString("garbage".getBytes())))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void limitOutOfBoundsIsA400() throws Exception {
+        mockMvc.perform(feed(viewer, 0, null))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(feed(viewer, 101, null))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/post/MeCommunityStatsIntegrationTest.java

@@ -0,0 +1,237 @@
+package com.patbond.patbond.community.post;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+import java.util.concurrent.Callable;
+import java.util.concurrent.CyclicBarrier;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.patch;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.put;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * T3.5-06 获赞聚合：GET /api/v1/me/community-stats。口径（ADR-022，读侧实时
+ * 聚合，不引冗余列）：
+ *
+ * <ul>
+ *   <li>{@code receivedLikeCount} = 本人「已发布且未软删」帖的 like_count 之和；</li>
+ *   <li>{@code publishedPostCount} = 同一集合的帖子数；</li>
+ *   <li>草稿不计（尚非作品）、软删不计（删帖即撤回其数字）、他人的帖不计；</li>
+ *   <li>空数据答 0 而非 null，任何已认证用户都有 stats，从不 404。</li>
+ * </ul>
+ */
+class MeCommunityStatsIntegrationTest extends PostApiTestBase {
+
+    private static final String DRAFT = "{\"content\":\"草稿内容\"}";
+    private static final String PUBLISHED = "{\"content\":\"已发布内容\",\"status\":\"published\"}";
+
+    private JsonNode stats(UUID userId) throws Exception {
+        return data(mockMvc.perform(authed(get("/api/v1/me/community-stats"), userId))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.code").value(0))
+                .andReturn());
+    }
+
+    private void like(UUID actor, String postId) throws Exception {
+        mockMvc.perform(authed(put("/api/v1/posts/{postId}/like", postId), actor))
+                .andExpect(status().isOk());
+    }
+
+    // ---- 成功路径 + 空数据 ----------------------------------------------
+
+    @Test
+    void freshUserGetsZerosNotNullsAndNever404() throws Exception {
+        JsonNode stats = stats(newUser());
+        assertThat(stats.get("receivedLikeCount").isNull()).isFalse();
+        assertThat(stats.get("publishedPostCount").isNull()).isFalse();
+        assertThat(stats.get("receivedLikeCount").asLong()).isZero();
+        assertThat(stats.get("publishedPostCount").asLong()).isZero();
+    }
+
+    @Test
+    void sumsLikesAcrossThePublishedPostsOfTheCaller() throws Exception {
+        UUID author = newUser();
+        UUID fanA = newUser();
+        UUID fanB = newUser();
+        String first = createPost(author, PUBLISHED).get("id").asText();
+        String second = createPost(author, PUBLISHED).get("id").asText();
+
+        like(fanA, first);
+        like(fanB, first);
+        like(fanA, second);
+
+        JsonNode stats = stats(author);
+        assertThat(stats.get("receivedLikeCount").asLong()).isEqualTo(3);
+        assertThat(stats.get("publishedPostCount").asLong()).isEqualTo(2);
+    }
+
+    @Test
+    void countsSelfLikesExactlyAsThePerPostNumberDoes() throws Exception {
+        UUID author = newUser();
+        String postId = createPost(author, PUBLISHED).get("id").asText();
+        like(author, postId);
+
+        assertThat(stats(author).get("receivedLikeCount").asLong()).isEqualTo(1);
+    }
+
+    @Test
+    void unlikingBringsTheNumberBackDown() throws Exception {
+        UUID author = newUser();
+        UUID fan = newUser();
+        String postId = createPost(author, PUBLISHED).get("id").asText();
+        like(fan, postId);
+        assertThat(stats(author).get("receivedLikeCount").asLong()).isEqualTo(1);
+
+        mockMvc.perform(authed(delete("/api/v1/posts/{postId}/like", postId), fan))
+                .andExpect(status().isOk());
+        assertThat(stats(author).get("receivedLikeCount").asLong()).isZero();
+    }
+
+    // ---- 口径边界：草稿 / 软删 / 他人 -----------------------------------
+
+    @Test
+    void draftsAreExcludedFromBothNumbers() throws Exception {
+        UUID author = newUser();
+        createPost(author, DRAFT);
+        createPost(author, DRAFT);
+
+        JsonNode before = stats(author);
+        assertThat(before.get("publishedPostCount").asLong()).isZero();
+        assertThat(before.get("receivedLikeCount").asLong()).isZero();
+
+        // 发布其中一篇后才计入
+        String draftId = createPost(author, DRAFT).get("id").asText();
+        mockMvc.perform(authed(patch("/api/v1/posts/{postId}", draftId), author)
+                        .content("{\"version\":0,\"status\":\"published\"}"))
+                .andExpect(status().isOk());
+        assertThat(stats(author).get("publishedPostCount").asLong()).isEqualTo(1);
+    }
+
+    @Test
+    void softDeletedPostsDropOutOfBothNumbers() throws Exception {
+        UUID author = newUser();
+        UUID fan = newUser();
+        String keep = createPost(author, PUBLISHED).get("id").asText();
+        String doomed = createPost(author, PUBLISHED).get("id").asText();
+        like(fan, keep);
+        like(fan, doomed);
+        assertThat(stats(author).get("receivedLikeCount").asLong()).isEqualTo(2);
+
+        mockMvc.perform(authed(delete("/api/v1/posts/{postId}", doomed), author))
+                .andExpect(status().isOk());
+
+        JsonNode after = stats(author);
+        assertThat(after.get("receivedLikeCount").asLong()).isEqualTo(1);
+        assertThat(after.get("publishedPostCount").asLong()).isEqualTo(1);
+    }
+
+    @Test
+    void otherPeoplesPostsNeverLeakIntoMyStats() throws Exception {
+        UUID me = newUser();
+        UUID other = newUser();
+        UUID fan = newUser();
+        String theirs = createPost(other, PUBLISHED).get("id").asText();
+        like(fan, theirs);
+        like(me, theirs);
+
+        JsonNode mine = stats(me);
+        assertThat(mine.get("receivedLikeCount").asLong()).isZero();
+        assertThat(mine.get("publishedPostCount").asLong()).isZero();
+        // 对方的数字是对方的
+        assertThat(stats(other).get("receivedLikeCount").asLong()).isEqualTo(2);
+    }
+
+    /**
+     * hidden/archived 是运营态（D3-7），在 M3 契约里对所有人不可见，因此也不计
+     * 入作品数——「看不到的帖不该出现在我的作品计数里」。
+     */
+    @Test
+    void operationalStatesAreExcluded() throws Exception {
+        UUID author = newUser();
+        String postId = createPost(author, PUBLISHED).get("id").asText();
+        assertThat(stats(author).get("publishedPostCount").asLong()).isEqualTo(1);
+
+        jdbcClient.sql("UPDATE community.posts SET status = 'hidden' WHERE id = :id")
+                .param("id", UUID.fromString(postId))
+                .update();
+        assertThat(stats(author).get("publishedPostCount").asLong()).isZero();
+    }
+
+    // ---- 无权限 / 不存在 -------------------------------------------------
+
+    @Test
+    void requiresAValidAccessToken() throws Exception {
+        mockMvc.perform(get("/api/v1/me/community-stats"))
+                .andExpect(status().isUnauthorized())
+                .andExpect(jsonPath("$.code").value(40101));
+        mockMvc.perform(get("/api/v1/me/community-stats")
+                        .header("Authorization", "Bearer not.a.jwt"))
+                .andExpect(status().isUnauthorized())
+                .andExpect(jsonPath("$.code").value(40101));
+    }
+
+    /**
+     * 主体永远是 token 里的自己，路径上没有可枚举的 userId —— 「查不到别人的
+     * 获赞」不靠权限判断，而靠端点形态本身就没有别人的入口。
+     */
+    @Test
+    void hasNoPathParameterToProbeSomeoneElse() throws Exception {
+        UUID me = newUser();
+        mockMvc.perform(authed(get("/api/v1/me/community-stats/{userId}", newUser()), me))
+                .andExpect(status().isNotFound());
+    }
+
+    // ---- 并发与重放 -----------------------------------------------------
+
+    /**
+     * 读侧聚合天然幂等：并发重复读必须给出同一答案，且不产生任何副作用
+     * （连续两次读的数字完全相同）。
+     */
+    @Test
+    void concurrentAndRepeatedReadsAreIdenticalAndSideEffectFree() throws Exception {
+        UUID author = newUser();
+        UUID fan = newUser();
+        String postId = createPost(author, PUBLISHED).get("id").asText();
+        like(fan, postId);
+
+        CyclicBarrier startTogether = new CyclicBarrier(2);
+        ExecutorService pool = Executors.newFixedThreadPool(2);
+        try {
+            Callable<Long> read = () -> {
+                startTogether.await();
+                return stats(author).get("receivedLikeCount").asLong();
+            };
+            Future<Long> first = pool.submit(read);
+            Future<Long> second = pool.submit(read);
+            assertThat(first.get()).isEqualTo(1);
+            assertThat(second.get()).isEqualTo(1);
+        } finally {
+            pool.shutdownNow();
+        }
+
+        assertThat(stats(author).get("receivedLikeCount").asLong()).isEqualTo(1);
+        assertThat(stats(author).get("publishedPostCount").asLong()).isEqualTo(1);
+    }
+
+    // ---- 形态回归 -------------------------------------------------------
+
+    @Test
+    void payloadCarriesExactlyTheTwoNumbers() throws Exception {
+        UUID author = newUser();
+        mockMvc.perform(authed(get("/api/v1/me/community-stats"), author))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.receivedLikeCount").value(0))
+                .andExpect(jsonPath("$.data.publishedPostCount").value(0))
+                .andExpect(jsonPath("$.data.followerCount").doesNotExist())
+                .andExpect(jsonPath("$.data.userId").doesNotExist());
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/post/PostApiTestBase.java

@@ -0,0 +1,95 @@
+package com.patbond.patbond.community.post;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.patbond.patbond.community.TestcontainersConfiguration;
+import com.patbond.patbond.community.support.CommunityTestData;
+import com.patbond.patbond.community.support.StubAuthorProfileConfig;
+import com.patbond.patbond.community.support.TestJwtKeys;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.jdbc.core.simple.JdbcClient;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+import org.springframework.test.web.servlet.MockMvc;
+import org.springframework.test.web.servlet.MvcResult;
+import org.springframework.test.web.servlet.request.MockHttpServletRequestBuilder;
+
+import java.time.Duration;
+import java.util.UUID;
+import java.util.concurrent.ThreadLocalRandom;
+
+import static org.springframework.http.MediaType.APPLICATION_JSON;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.post;
+
+/**
+ * Shared plumbing of the T3-04 post-lifecycle tests: one cached Spring
+ * context over a disposable postgres:18 with the full V1..V5 chain, JWT
+ * material minted per run, and media signing configured with fake
+ * credentials — presigning a GET URL is a local SigV4 computation, so URL
+ * assertions need no MinIO container.
+ */
+@SpringBootTest
+@AutoConfigureMockMvc
+@Import({TestcontainersConfiguration.class, StubAuthorProfileConfig.class})
+public abstract class PostApiTestBase {
+
+    @Autowired
+    protected MockMvc mockMvc;
+
+    @Autowired
+    protected ObjectMapper objectMapper;
+
+    @Autowired
+    protected JdbcClient jdbcClient;
+
+    @DynamicPropertySource
+    static void properties(DynamicPropertyRegistry registry) {
+        registry.add("patbond.jwt.public-key", TestJwtKeys::publicPem);
+        registry.add("patbond.media.public-endpoint", () -> "http://127.0.0.1:9000");
+        registry.add("patbond.media.access-key", () -> "test-access-key");
+        registry.add("patbond.media.secret-key", () -> "test-secret-key");
+    }
+
+    protected UUID newUser() {
+        return CommunityTestData.insertUser(jdbcClient,
+                "u" + Long.toHexString(ThreadLocalRandom.current().nextLong() & 0x7FFFFFFFFFFFFFFFL));
+    }
+
+    protected String token(UUID userId) {
+        return TestJwtKeys.accessToken(TestJwtKeys.KEY_PAIR.getPrivate(), userId,
+                Duration.ofMinutes(15));
+    }
+
+    protected MockHttpServletRequestBuilder authed(MockHttpServletRequestBuilder builder,
+                                                   UUID userId) {
+        return builder.header("Authorization", "Bearer " + token(userId))
+                .contentType(APPLICATION_JSON)
+                .characterEncoding("UTF-8");
+    }
+
+    protected MockHttpServletRequestBuilder createPostRequest(UUID userId, String idempotencyKey,
+                                                              String body) {
+        return authed(post("/api/v1/posts"), userId)
+                .header("Idempotency-Key", idempotencyKey)
+                .content(body);
+    }
+
+    /** Creates a post and returns the response `data` node. */
+    protected JsonNode createPost(UUID userId, String body) throws Exception {
+        MvcResult result = mockMvc.perform(
+                        createPostRequest(userId, UUID.randomUUID().toString(), body))
+                .andReturn();
+        if (result.getResponse().getStatus() != 201) {
+            throw new AssertionError("createPost failed: " + result.getResponse().getStatus()
+                    + " " + result.getResponse().getContentAsString());
+        }
+        return data(result);
+    }
+
+    protected JsonNode data(MvcResult result) throws Exception {
+        return objectMapper.readTree(result.getResponse().getContentAsString()).get("data");
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/post/PostIdempotencyIntegrationTest.java

@@ -0,0 +1,101 @@
+package com.patbond.patbond.community.post;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * ADR-019 幂等专项: creation-type idempotency on the posts table itself —
+ * mandatory Idempotency-Key falling on uq_posts_author_idempotency with a
+ * stored request_hash. Same key + same payload replays the first write,
+ * same key + different payload answers 40905, keys are scoped per author.
+ */
+class PostIdempotencyIntegrationTest extends PostApiTestBase {
+
+    @Test
+    void sameKeySamePayloadReturnsTheFirstWrite() throws Exception {
+        UUID author = newUser();
+        String key = UUID.randomUUID().toString();
+        String body = "{\"title\": \"幂等\", \"content\": \"同键同体\"}";
+        JsonNode first = data(mockMvc.perform(createPostRequest(author, key, body))
+                .andExpect(status().isCreated())
+                .andReturn());
+        JsonNode retry = data(mockMvc.perform(createPostRequest(author, key, body))
+                .andExpect(status().isCreated())
+                .andReturn());
+        assertThat(retry.get("id").asText()).isEqualTo(first.get("id").asText());
+        Long rows = jdbcClient.sql(
+                        "SELECT count(*) FROM community.posts WHERE author_user_id = :author")
+                .param("author", author)
+                .query(Long.class)
+                .single();
+        assertThat(rows).isEqualTo(1);
+    }
+
+    @Test
+    void semanticallyIdenticalPayloadStillReplays() throws Exception {
+        // The hash covers the NORMALIZED command, so whitespace-only
+        // differences (or a spelled-out default) do not break a retry.
+        UUID author = newUser();
+        String key = UUID.randomUUID().toString();
+        JsonNode first = data(mockMvc.perform(createPostRequest(author, key,
+                        "{\"content\": \"规范化\"}"))
+                .andExpect(status().isCreated())
+                .andReturn());
+        JsonNode retry = data(mockMvc.perform(createPostRequest(author, key,
+                        "{\"content\": \"  规范化  \", \"category\": \"general\", \"status\": \"draft\"}"))
+                .andExpect(status().isCreated())
+                .andReturn());
+        assertThat(retry.get("id").asText()).isEqualTo(first.get("id").asText());
+    }
+
+    @Test
+    void sameKeyDifferentPayloadAnswers40905() throws Exception {
+        UUID author = newUser();
+        String key = UUID.randomUUID().toString();
+        mockMvc.perform(createPostRequest(author, key, "{\"content\": \"版本甲\"}"))
+                .andExpect(status().isCreated());
+        mockMvc.perform(createPostRequest(author, key, "{\"content\": \"版本乙\"}"))
+                .andExpect(status().isConflict())
+                .andExpect(jsonPath("$.code").value(40905));
+    }
+
+    @Test
+    void keysAreScopedPerAuthor() throws Exception {
+        UUID alice = newUser();
+        UUID bob = newUser();
+        String key = "shared-client-key";
+        JsonNode alicesPost = data(mockMvc.perform(createPostRequest(alice, key,
+                        "{\"content\": \"撞键\"}"))
+                .andExpect(status().isCreated())
+                .andReturn());
+        JsonNode bobsPost = data(mockMvc.perform(createPostRequest(bob, key,
+                        "{\"content\": \"撞键\"}"))
+                .andExpect(status().isCreated())
+                .andReturn());
+        assertThat(bobsPost.get("id").asText()).isNotEqualTo(alicesPost.get("id").asText());
+    }
+
+    @Test
+    void retryAfterTheFirstWriteWasDeletedAnswers404() throws Exception {
+        // Edge frozen for the contract: the retry asks about a resource that
+        // is gone — same anti-enumeration 404 as any other deleted post.
+        UUID author = newUser();
+        String key = UUID.randomUUID().toString();
+        String body = "{\"content\": \"建了又删\"}";
+        String id = data(mockMvc.perform(createPostRequest(author, key, body))
+                .andExpect(status().isCreated())
+                .andReturn()).get("id").asText();
+        mockMvc.perform(authed(delete("/api/v1/posts/" + id), author))
+                .andExpect(status().isOk());
+        mockMvc.perform(createPostRequest(author, key, body))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40403));
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/post/PostLifecycleIntegrationTest.java

@@ -0,0 +1,376 @@
+package com.patbond.patbond.community.post;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.patbond.patbond.community.support.CommunityTestData;
+import org.junit.jupiter.api.Test;
+
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.CountDownLatch;
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.concurrent.TimeUnit;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.delete;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.patch;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * T3-04 lifecycle walk on the real database: draft → edit → publish →
+ * detail → delete, the 403/404 permission boundary, the draft-visibility
+ * matrix, the optimistic lock (including a true concurrent race) and the
+ * my-posts cursor list. These assertions ARE the T3-10 freeze input for the
+ * post domain's permission and error semantics.
+ */
+class PostLifecycleIntegrationTest extends PostApiTestBase {
+
+    @Test
+    void createDraftReturnsFullShape() throws Exception {
+        UUID author = newUser();
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        """
+                        {"title": "第一帖", "content": "大家好"}
+                        """))
+                .andExpect(status().isCreated())
+                .andExpect(jsonPath("$.code").value(0))
+                .andExpect(jsonPath("$.data.id").isNotEmpty())
+                .andExpect(jsonPath("$.data.author.userId").value(author.toString()))
+                .andExpect(jsonPath("$.data.title").value("第一帖"))
+                .andExpect(jsonPath("$.data.content").value("大家好"))
+                .andExpect(jsonPath("$.data.category").value("general"))
+                .andExpect(jsonPath("$.data.status").value("draft"))
+                .andExpect(jsonPath("$.data.visibility").value("public"))
+                .andExpect(jsonPath("$.data.media").isEmpty())
+                .andExpect(jsonPath("$.data.likeCount").value(0))
+                .andExpect(jsonPath("$.data.commentCount").value(0))
+                .andExpect(jsonPath("$.data.bookmarkCount").value(0))
+                .andExpect(jsonPath("$.data.likedByMe").value(false))
+                .andExpect(jsonPath("$.data.bookmarkedByMe").value(false))
+                .andExpect(jsonPath("$.data.publishedAt").isEmpty())
+                .andExpect(jsonPath("$.data.version").value(0));
+    }
+
+    @Test
+    void createPublishedDirectlyWritesPublishedAt() throws Exception {
+        UUID author = newUser();
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        """
+                        {"content": "直接发布", "status": "published", "category": "help"}
+                        """))
+                .andExpect(status().isCreated())
+                .andExpect(jsonPath("$.data.status").value("published"))
+                .andExpect(jsonPath("$.data.category").value("help"))
+                .andExpect(jsonPath("$.data.publishedAt").isNotEmpty());
+    }
+
+    @Test
+    void createWithVisiblePetAttachesIt() throws Exception {
+        UUID author = newUser();
+        UUID petId = CommunityTestData.insertPetOwnedBy(jdbcClient, author);
+        JsonNode created = createPost(author,
+                "{\"content\": \"我家猫\", \"petId\": \"" + petId + "\"}");
+        assertThat(created.get("petId").asText()).isEqualTo(petId.toString());
+    }
+
+    @Test
+    void createWithInvisibleOrMissingPetAnswers40401() throws Exception {
+        UUID author = newUser();
+        UUID stranger = newUser();
+        UUID strangersPet = CommunityTestData.insertPetOwnedBy(jdbcClient, stranger);
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        "{\"content\": \"x\", \"petId\": \"" + strangersPet + "\"}"))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40401));
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        "{\"content\": \"x\", \"petId\": \"" + UUID.randomUUID() + "\"}"))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40401));
+    }
+
+    @Test
+    void createValidationFailuresAnswer40000() throws Exception {
+        UUID author = newUser();
+        // content is mandatory
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        "{\"title\": \"无正文\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        // ai_creation is an M4 read-side reservation, not writable in M3
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        "{\"content\": \"x\", \"category\": \"ai_creation\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        // hidden/archived are not creatable states
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        "{\"content\": \"x\", \"status\": \"hidden\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        // a whitespace-only title is rejected, not silently cleared to null
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        "{\"content\": \"x\", \"title\": \"   \"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void idempotencyKeyHeaderIsMandatoryAndBounded() throws Exception {
+        UUID author = newUser();
+        mockMvc.perform(authed(
+                        org.springframework.test.web.servlet.request.MockMvcRequestBuilders
+                                .post("/api/v1/posts"), author)
+                        .content("{\"content\": \"没带幂等键\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(createPostRequest(author, "   ", "{\"content\": \"空白键\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(createPostRequest(author, "k".repeat(129), "{\"content\": \"超长键\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void draftVisibilityMatrix() throws Exception {
+        UUID author = newUser();
+        UUID other = newUser();
+        JsonNode draft = createPost(author, "{\"content\": \"草稿\"}");
+        String draftId = draft.get("id").asText();
+        JsonNode published = createPost(author,
+                "{\"content\": \"已发布\", \"status\": \"published\"}");
+        String publishedId = published.get("id").asText();
+
+        // author sees the draft; anyone else gets the anti-enumeration 404
+        mockMvc.perform(authed(get("/api/v1/posts/" + draftId), author))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.status").value("draft"));
+        mockMvc.perform(authed(get("/api/v1/posts/" + draftId), other))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40403));
+
+        // published is open to any authenticated user
+        mockMvc.perform(authed(get("/api/v1/posts/" + publishedId), other))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.status").value("published"));
+
+        // hidden (operational state, D3-7) answers 404 to EVERYONE — the
+        // author included: the M3 contract's status enum stays two-valued
+        jdbcClient.sql("UPDATE community.posts SET status = 'hidden', published_at = NULL WHERE id = :id")
+                .param("id", UUID.fromString(publishedId))
+                .update();
+        mockMvc.perform(authed(get("/api/v1/posts/" + publishedId), author))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40403));
+
+        // nonexistent id — identical 404; malformed id — 40000
+        mockMvc.perform(authed(get("/api/v1/posts/" + UUID.randomUUID()), author))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40403));
+        mockMvc.perform(authed(get("/api/v1/posts/not-a-uuid"), author))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void patchEditsFieldsAndBumpsVersion() throws Exception {
+        UUID author = newUser();
+        String id = createPost(author, "{\"title\": \"旧标题\", \"content\": \"旧正文\"}")
+                .get("id").asText();
+        mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"version\": 0, \"title\": \"新标题\"}"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.title").value("新标题"))
+                .andExpect(jsonPath("$.data.content").value("旧正文"))
+                .andExpect(jsonPath("$.data.version").value(1));
+        // the spent version is stale now — optimistic lock answers 40902
+        mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"version\": 0, \"title\": \"迟到的编辑\"}"))
+                .andExpect(status().isConflict())
+                .andExpect(jsonPath("$.code").value(40902));
+        // version is mandatory
+        mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"title\": \"没带 version\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void publishIsThePatchStateTransition() throws Exception {
+        UUID author = newUser();
+        String id = createPost(author, "{\"content\": \"待发布\"}").get("id").asText();
+        String publishedAt = data(mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"version\": 0, \"status\": \"published\"}"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.status").value("published"))
+                .andExpect(jsonPath("$.data.publishedAt").isNotEmpty())
+                .andReturn()).get("publishedAt").asText();
+        // re-publishing an already-published post is a no-op (publishedAt
+        // written exactly once), not an error
+        mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"version\": 1, \"status\": \"published\"}"))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.publishedAt").value(publishedAt))
+                .andExpect(jsonPath("$.data.version").value(2));
+        // published→draft does not exist: the request enum rejects it
+        mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"version\": 2, \"status\": \"draft\"}"))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void nonAuthorWritesWalkThe403404Boundary() throws Exception {
+        UUID author = newUser();
+        UUID other = newUser();
+        String draftId = createPost(author, "{\"content\": \"草稿\"}").get("id").asText();
+        String publishedId = createPost(author,
+                "{\"content\": \"已发布\", \"status\": \"published\"}").get("id").asText();
+
+        // visible but not yours → 403/40301
+        mockMvc.perform(authed(patch("/api/v1/posts/" + publishedId), other)
+                        .content("{\"version\": 0, \"title\": \"篡改\"}"))
+                .andExpect(status().isForbidden())
+                .andExpect(jsonPath("$.code").value(40301));
+        mockMvc.perform(authed(delete("/api/v1/posts/" + publishedId), other))
+                .andExpect(status().isForbidden())
+                .andExpect(jsonPath("$.code").value(40301));
+
+        // invisible (someone else's draft) → 404/40403, never 403
+        mockMvc.perform(authed(patch("/api/v1/posts/" + draftId), other)
+                        .content("{\"version\": 0, \"title\": \"篡改\"}"))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40403));
+        mockMvc.perform(authed(delete("/api/v1/posts/" + draftId), other))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40403));
+    }
+
+    @Test
+    void deleteIsSoftAndMergesWithNotFoundAfterwards() throws Exception {
+        UUID author = newUser();
+        String id = createPost(author,
+                "{\"content\": \"要删的\", \"status\": \"published\"}").get("id").asText();
+        mockMvc.perform(authed(delete("/api/v1/posts/" + id), author))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.code").value(0));
+        // gone from every read path…
+        mockMvc.perform(authed(get("/api/v1/posts/" + id), author))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40403));
+        // …and a repeated delete merges with not-found (anti-enumeration)
+        mockMvc.perform(authed(delete("/api/v1/posts/" + id), author))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40403));
+        // the row survives as a soft-deleted tombstone; the published row is
+        // parked as archived so ck_posts_publish_state holds
+        var row = jdbcClient.sql(
+                        "SELECT status, deleted_at FROM community.posts WHERE id = :id")
+                .param("id", UUID.fromString(id))
+                .query((rs, n) -> List.of(rs.getString("status"),
+                        String.valueOf(rs.getObject("deleted_at") != null)))
+                .single();
+        assertThat(row).containsExactly("archived", "true");
+    }
+
+    @Test
+    void concurrentPatchesLetExactlyOneWin() throws Exception {
+        UUID author = newUser();
+        String id = createPost(author, "{\"content\": \"并发对象\"}").get("id").asText();
+        CountDownLatch start = new CountDownLatch(1);
+        ExecutorService pool = Executors.newFixedThreadPool(2);
+        try {
+            List<Future<Integer>> results = List.of("甲", "乙").stream()
+                    .map(tag -> pool.submit(() -> {
+                        start.await();
+                        return mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                                        .content("{\"version\": 0, \"title\": \"" + tag + "\"}"))
+                                .andReturn().getResponse().getStatus();
+                    }))
+                    .toList();
+            start.countDown();
+            List<Integer> statuses = List.of(results.get(0).get(30, TimeUnit.SECONDS),
+                    results.get(1).get(30, TimeUnit.SECONDS));
+            assertThat(statuses).containsExactlyInAnyOrder(200, 409);
+        } finally {
+            pool.shutdownNow();
+        }
+        mockMvc.perform(authed(get("/api/v1/posts/" + id), author))
+                .andExpect(jsonPath("$.data.version").value(1));
+    }
+
+    @Test
+    void myPostsListPagesWithCursorAndFilters() throws Exception {
+        UUID author = newUser();
+        UUID other = newUser();
+        String draft1 = createPost(author, "{\"content\": \"甲\"}").get("id").asText();
+        String published = createPost(author,
+                "{\"content\": \"乙\", \"status\": \"published\"}").get("id").asText();
+        String draft2 = createPost(author, "{\"content\": \"丙\"}").get("id").asText();
+        String deleted = createPost(author, "{\"content\": \"已删\"}").get("id").asText();
+        mockMvc.perform(authed(delete("/api/v1/posts/" + deleted), author))
+                .andExpect(status().isOk());
+        createPost(other, "{\"content\": \"别人的\"}");
+
+        // full list: own drafts + published, deleted excluded, newest first
+        JsonNode page = data(mockMvc.perform(authed(get("/api/v1/me/posts"), author))
+                .andExpect(status().isOk())
+                .andExpect(jsonPath("$.data.hasMore").value(false))
+                .andExpect(jsonPath("$.data.nextCursor").isEmpty())
+                .andReturn());
+        assertThat(page.get("items")).hasSize(3);
+        assertThat(page.get("items").findValues("id").stream().map(JsonNode::asText))
+                .containsExactly(draft2, published, draft1);
+
+        // keyset pagination: limit 2 → cursor → remaining 1, no loss/overlap
+        JsonNode first = data(mockMvc.perform(authed(get("/api/v1/me/posts?limit=2"), author))
+                .andExpect(jsonPath("$.data.hasMore").value(true))
+                .andReturn());
+        JsonNode second = data(mockMvc.perform(authed(
+                        get("/api/v1/me/posts?limit=2&cursor=" + first.get("nextCursor").asText()),
+                        author))
+                .andExpect(jsonPath("$.data.hasMore").value(false))
+                .andReturn());
+        assertThat(second.get("items")).hasSize(1);
+        assertThat(second.get("items").get(0).get("id").asText()).isEqualTo(draft1);
+
+        // status filter, bad filter, bad cursor, bad limit
+        mockMvc.perform(authed(get("/api/v1/me/posts?status=draft"), author))
+                .andExpect(jsonPath("$.data.items.length()").value(2));
+        mockMvc.perform(authed(get("/api/v1/me/posts?status=hidden"), author))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(authed(get("/api/v1/me/posts?cursor=%21%21"), author))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+        mockMvc.perform(authed(get("/api/v1/me/posts?limit=0"), author))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    @Test
+    void viewerRelativeFlagsReflectRelationRows() throws Exception {
+        UUID author = newUser();
+        UUID fan = newUser();
+        String id = createPost(author,
+                "{\"content\": \"有人点赞\", \"status\": \"published\"}").get("id").asText();
+        jdbcClient.sql("""
+                        INSERT INTO community.post_likes (post_id, user_id) VALUES (:postId, :userId)
+                        """)
+                .param("postId", UUID.fromString(id))
+                .param("userId", fan)
+                .update();
+        jdbcClient.sql("UPDATE community.posts SET like_count = 1 WHERE id = :id")
+                .param("id", UUID.fromString(id))
+                .update();
+        mockMvc.perform(authed(get("/api/v1/posts/" + id), fan))
+                .andExpect(jsonPath("$.data.likedByMe").value(true))
+                .andExpect(jsonPath("$.data.likeCount").value(1))
+                .andExpect(jsonPath("$.data.bookmarkedByMe").value(false));
+        mockMvc.perform(authed(get("/api/v1/posts/" + id), author))
+                .andExpect(jsonPath("$.data.likedByMe").value(false))
+                .andExpect(jsonPath("$.data.likeCount").value(1));
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/post/PostMediaAttachIntegrationTest.java

@@ -0,0 +1,171 @@
+package com.patbond.patbond.community.post;
+
+import com.fasterxml.jackson.databind.JsonNode;
+import com.patbond.patbond.community.support.CommunityTestData;
+import org.junit.jupiter.api.Test;
+
+import java.util.UUID;
+
+import static org.assertj.core.api.Assertions.assertThat;
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.patch;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * post_media attach semantics (T3-03 联调协议 on the referencing side):
+ * only the caller's own ready assets; position/is_cover normalization
+ * consistent with uq_post_media_cover; PATCH media replaces the whole set.
+ */
+class PostMediaAttachIntegrationTest extends PostApiTestBase {
+
+    @Test
+    void attachOrdersItemsAndDefaultsTheCover() throws Exception {
+        UUID author = newUser();
+        UUID assetA = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        UUID assetB = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        JsonNode post = createPost(author, """
+                {"content": "两张图", "media": [
+                  {"assetId": "%s", "caption": " 封面图 "},
+                  {"assetId": "%s"}
+                ]}
+                """.formatted(assetA, assetB));
+        JsonNode media = post.get("media");
+        assertThat(media).hasSize(2);
+        // array order → positions 0/1; no isCover given → position 0 is cover
+        assertThat(media.get(0).get("assetId").asText()).isEqualTo(assetA.toString());
+        assertThat(media.get(0).get("position").asInt()).isZero();
+        assertThat(media.get(0).get("isCover").asBoolean()).isTrue();
+        assertThat(media.get(0).get("caption").asText()).isEqualTo("封面图");
+        assertThat(media.get(1).get("isCover").asBoolean()).isFalse();
+        // presigned GET URL, signed against the configured public endpoint
+        assertThat(media.get(0).get("url").asText())
+                .startsWith("http://127.0.0.1:9000/patbond-media/post_image/")
+                .contains("X-Amz-Signature=");
+        assertThat(media.get(0).get("widthPx").asInt()).isEqualTo(640);
+        assertThat(media.get(0).get("heightPx").asInt()).isEqualTo(480);
+    }
+
+    @Test
+    void explicitPositionsAndCoverAreRespected() throws Exception {
+        UUID author = newUser();
+        UUID assetA = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        UUID assetB = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        JsonNode post = createPost(author, """
+                {"content": "指定顺序", "media": [
+                  {"assetId": "%s", "position": 1},
+                  {"assetId": "%s", "position": 0, "isCover": true}
+                ]}
+                """.formatted(assetA, assetB));
+        JsonNode media = post.get("media");
+        assertThat(media.get(0).get("assetId").asText()).isEqualTo(assetB.toString());
+        assertThat(media.get(0).get("isCover").asBoolean()).isTrue();
+        assertThat(media.get(1).get("assetId").asText()).isEqualTo(assetA.toString());
+    }
+
+    @Test
+    void foreignMissingOrDeletedAssetsMergeInto40405() throws Exception {
+        UUID author = newUser();
+        UUID stranger = newUser();
+        UUID strangersAsset = CommunityTestData.insertReadyAsset(jdbcClient, stranger);
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        mediaBody(strangersAsset)))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40405));
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        mediaBody(UUID.randomUUID())))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40405));
+    }
+
+    @Test
+    void ownButNotReadyAssetAnswers42203() throws Exception {
+        UUID author = newUser();
+        UUID uploading = CommunityTestData.insertAsset(jdbcClient, author, "uploading");
+        UUID failed = CommunityTestData.insertAsset(jdbcClient, author, "failed");
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        mediaBody(uploading)))
+                .andExpect(status().isUnprocessableEntity())
+                .andExpect(jsonPath("$.code").value(42203));
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(),
+                        mediaBody(failed)))
+                .andExpect(status().isUnprocessableEntity())
+                .andExpect(jsonPath("$.code").value(42203));
+    }
+
+    @Test
+    void mediaShapeViolationsAnswer40000() throws Exception {
+        UUID author = newUser();
+        UUID assetA = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        UUID assetB = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        // duplicate assetId
+        expectBadRequest(author, """
+                {"content": "x", "media": [{"assetId": "%s"}, {"assetId": "%s"}]}
+                """.formatted(assetA, assetA));
+        // two covers (uq_post_media_cover)
+        expectBadRequest(author, """
+                {"content": "x", "media": [
+                  {"assetId": "%s", "isCover": true}, {"assetId": "%s", "isCover": true}]}
+                """.formatted(assetA, assetB));
+        // positions must be 0-based contiguous
+        expectBadRequest(author, """
+                {"content": "x", "media": [
+                  {"assetId": "%s", "position": 0}, {"assetId": "%s", "position": 2}]}
+                """.formatted(assetA, assetB));
+        // all-or-none positions
+        expectBadRequest(author, """
+                {"content": "x", "media": [
+                  {"assetId": "%s", "position": 0}, {"assetId": "%s"}]}
+                """.formatted(assetA, assetB));
+    }
+
+    @Test
+    void patchMediaReplacesTheWholeSet() throws Exception {
+        UUID author = newUser();
+        UUID assetA = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        UUID assetB = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        UUID assetC = CommunityTestData.insertReadyAsset(jdbcClient, author);
+        String id = createPost(author, """
+                {"content": "初始两图", "media": [{"assetId": "%s"}, {"assetId": "%s"}]}
+                """.formatted(assetA, assetB)).get("id").asText();
+
+        // media present in the PATCH → whole-set replacement (整组替换)
+        JsonNode replaced = data(mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"version\": 0, \"media\": [{\"assetId\": \"" + assetC + "\"}]}"))
+                .andExpect(status().isOk())
+                .andReturn());
+        assertThat(replaced.get("media")).hasSize(1);
+        assertThat(replaced.get("media").get(0).get("assetId").asText())
+                .isEqualTo(assetC.toString());
+        assertThat(replaced.get("media").get(0).get("isCover").asBoolean()).isTrue();
+
+        // media absent → untouched
+        JsonNode untouched = data(mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"version\": 1, \"title\": \"只改标题\"}"))
+                .andExpect(status().isOk())
+                .andReturn());
+        assertThat(untouched.get("media")).hasSize(1);
+
+        // empty array → clears down to a text-only post
+        JsonNode cleared = data(mockMvc.perform(authed(patch("/api/v1/posts/" + id), author)
+                        .content("{\"version\": 2, \"media\": []}"))
+                .andExpect(status().isOk())
+                .andReturn());
+        assertThat(cleared.get("media")).isEmpty();
+        Long rows = jdbcClient.sql(
+                        "SELECT count(*) FROM community.post_media WHERE post_id = :id")
+                .param("id", UUID.fromString(id))
+                .query(Long.class)
+                .single();
+        assertThat(rows).isZero();
+    }
+
+    private void expectBadRequest(UUID author, String body) throws Exception {
+        mockMvc.perform(createPostRequest(author, UUID.randomUUID().toString(), body))
+                .andExpect(status().isBadRequest())
+                .andExpect(jsonPath("$.code").value(40000));
+    }
+
+    private static String mediaBody(UUID assetId) {
+        return "{\"content\": \"带图\", \"media\": [{\"assetId\": \"" + assetId + "\"}]}";
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/security/BearerAuthIntegrationTest.java

@@ -0,0 +1,87 @@
+package com.patbond.patbond.community.security;
+
+import com.patbond.patbond.community.TestcontainersConfiguration;
+import com.patbond.patbond.community.support.TestJwtKeys;
+import org.junit.jupiter.api.Test;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.boot.test.autoconfigure.web.servlet.AutoConfigureMockMvc;
+import org.springframework.boot.test.context.SpringBootTest;
+import org.springframework.context.annotation.Import;
+import org.springframework.test.context.DynamicPropertyRegistry;
+import org.springframework.test.context.DynamicPropertySource;
+import org.springframework.test.web.servlet.MockMvc;
+
+import java.time.Duration;
+import java.util.UUID;
+
+import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.get;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.jsonPath;
+import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
+
+/**
+ * The BearerAuthFilter guards every /api/v1/** route from the skeleton on
+ * (T3-02 acceptance): missing, forged, wrong-key and expired tokens all
+ * answer 401 with the 40101 envelope, while a valid token passes the filter
+ * (and reaches the 404 of a not-yet-implemented route instead of a 401).
+ */
+@SpringBootTest
+@AutoConfigureMockMvc
+@Import(TestcontainersConfiguration.class)
+class BearerAuthIntegrationTest {
+
+    @Autowired
+    private MockMvc mockMvc;
+
+    @DynamicPropertySource
+    static void jwtPublicKey(DynamicPropertyRegistry registry) {
+        registry.add("patbond.jwt.public-key", TestJwtKeys::publicPem);
+    }
+
+    @Test
+    void missingTokenAnswers401() throws Exception {
+        mockMvc.perform(get("/api/v1/posts"))
+                .andExpect(status().isUnauthorized())
+                .andExpect(jsonPath("$.code").value(40101));
+    }
+
+    @Test
+    void malformedTokenAnswers401() throws Exception {
+        mockMvc.perform(get("/api/v1/posts")
+                        .header("Authorization", "Bearer not-a-jwt"))
+                .andExpect(status().isUnauthorized())
+                .andExpect(jsonPath("$.code").value(40101));
+    }
+
+    @Test
+    void wrongKeyTokenAnswers401() throws Exception {
+        String forged = TestJwtKeys.accessToken(TestJwtKeys.WRONG_KEY_PAIR.getPrivate(),
+                UUID.randomUUID(), Duration.ofMinutes(15));
+        mockMvc.perform(get("/api/v1/posts")
+                        .header("Authorization", "Bearer " + forged))
+                .andExpect(status().isUnauthorized())
+                .andExpect(jsonPath("$.code").value(40101));
+    }
+
+    @Test
+    void expiredTokenAnswers401() throws Exception {
+        String expired = TestJwtKeys.accessToken(TestJwtKeys.KEY_PAIR.getPrivate(),
+                UUID.randomUUID(), Duration.ofMinutes(-5));
+        mockMvc.perform(get("/api/v1/posts")
+                        .header("Authorization", "Bearer " + expired))
+                .andExpect(status().isUnauthorized())
+                .andExpect(jsonPath("$.code").value(40101));
+    }
+
+    @Test
+    void validTokenPassesTheFilter() throws Exception {
+        // An unmapped route: an authenticated request reaches the 404
+        // envelope — proving the filter let it in. (/api/v1/posts is a real
+        // route since T3-04, so the probe moved to a path that stays free.)
+        String token = TestJwtKeys.accessToken(TestJwtKeys.KEY_PAIR.getPrivate(),
+                UUID.randomUUID(), Duration.ofMinutes(15));
+        mockMvc.perform(get("/api/v1/not-a-route")
+                        .header("Authorization", "Bearer " + token))
+                .andExpect(status().isNotFound())
+                .andExpect(jsonPath("$.code").value(40400));
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/support/CommunityTestData.java

@@ -0,0 +1,103 @@
+package com.patbond.patbond.community.support;
+
+import org.springframework.jdbc.core.simple.JdbcClient;
+
+import java.time.OffsetDateTime;
+import java.util.UUID;
+
+/**
+ * Direct-SQL fixtures for the cross-schema rows community tests depend on
+ * (identity.users, media.assets, pet_health.pets/pet_owners). The community
+ * service never writes those schemas in production — tests seed them the
+ * way the owning services would.
+ */
+public final class CommunityTestData {
+
+    private CommunityTestData() {
+    }
+
+    public static UUID insertUser(JdbcClient jdbc, String username) {
+        UUID id = UuidV7.generate();
+        jdbc.sql("INSERT INTO identity.users (id, username) VALUES (:id, :username)")
+                .param("id", id)
+                .param("username", username)
+                .update();
+        return id;
+    }
+
+    public static void setNickname(JdbcClient jdbc, UUID userId, String nickname) {
+        jdbc.sql("UPDATE identity.users SET nickname = :nickname WHERE id = :id")
+                .param("nickname", nickname)
+                .param("id", userId)
+                .update();
+    }
+
+    /** Gives the user an avatar asset in the given status; returns the asset id. */
+    public static UUID attachAvatar(JdbcClient jdbc, UUID userId, String status) {
+        UUID assetId = insertAsset(jdbc, userId, status);
+        jdbc.sql("UPDATE identity.users SET avatar_asset_id = :assetId WHERE id = :id")
+                .param("assetId", assetId)
+                .param("id", userId)
+                .update();
+        return assetId;
+    }
+
+    /** One ready image asset owned by the given user, as T3-03 would leave it. */
+    public static UUID insertReadyAsset(JdbcClient jdbc, UUID ownerUserId) {
+        return insertAsset(jdbc, ownerUserId, "ready");
+    }
+
+    public static UUID insertAsset(JdbcClient jdbc, UUID ownerUserId, String status) {
+        UUID id = UuidV7.generate();
+        jdbc.sql("""
+                        INSERT INTO media.assets
+                            (id, owner_user_id, kind, purpose, storage_type, bucket, object_key,
+                             mime_type, byte_size, width_px, height_px, status, ready_at)
+                        VALUES (:id, :owner, 'image', 'post_image', 'object', 'patbond-media',
+                                :objectKey, 'image/jpeg', 123, 640, 480, :status, :readyAt)
+                        """)
+                .param("id", id)
+                .param("owner", ownerUserId)
+                .param("objectKey", "post_image/2026/09/" + id + ".jpg")
+                .param("status", status)
+                .param("readyAt", "ready".equals(status) ? OffsetDateTime.now() : null)
+                .update();
+        return id;
+    }
+
+    /**
+     * A published post inserted straight into community.posts — used when a
+     * test must NOT go through the create API (whose response assembly
+     * would already resolve and cache the author's profile).
+     */
+    public static UUID insertPublishedPost(JdbcClient jdbc, UUID authorUserId, String content) {
+        UUID id = UuidV7.generate();
+        jdbc.sql("""
+                        INSERT INTO community.posts (id, author_user_id, content, status, published_at)
+                        VALUES (:id, :author, :content, 'published', now())
+                        """)
+                .param("id", id)
+                .param("author", authorUserId)
+                .param("content", content)
+                .update();
+        return id;
+    }
+
+    public static UUID insertPetOwnedBy(JdbcClient jdbc, UUID ownerUserId) {
+        UUID id = UuidV7.generate();
+        jdbc.sql("""
+                        INSERT INTO pet_health.pets (id, name, species, custom_breed_name)
+                        VALUES (:id, '毛毛', 'cat', '中华田园猫')
+                        """)
+                .param("id", id)
+                .update();
+        jdbc.sql("""
+                        INSERT INTO pet_health.pet_owners (pet_id, user_id, role, is_primary)
+                        VALUES (:petId, :userId, 'owner', true)
+                        """)
+                .param("petId", id)
+                .param("userId", ownerUserId)
+                .update();
+        return id;
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/support/StubAuthorProfileClient.java

@@ -0,0 +1,61 @@
+package com.patbond.patbond.community.support;
+
+import com.patbond.patbond.common.response.ApiResponse;
+import com.patbond.patbond.community.author.AuthorProfileClient;
+import com.patbond.patbond.community.author.AuthorProfileDto;
+import org.springframework.jdbc.core.simple.JdbcClient;
+
+import java.util.Arrays;
+import java.util.List;
+import java.util.UUID;
+import java.util.concurrent.atomic.AtomicInteger;
+
+/**
+ * In-process stand-in for patbond-user's /internal/users/profiles, wired in
+ * place of the Feign proxy (工单许可：Feign 层用替身，/internal 端点自身在
+ * patbond-user 模块测全；两服务同 JVM 的 AuthE2e 先例成本过高)。 It answers
+ * from identity.users with the same query the real endpoint runs — including
+ * the nickname→username fallback — so profile tests seed users exactly like
+ * every other cross-schema fixture. {@link #unavailable} simulates the user
+ * service being down (the gateway must degrade, not 5xx);
+ * {@link #invocations} makes the cache observable.
+ */
+public class StubAuthorProfileClient implements AuthorProfileClient {
+
+    private final JdbcClient jdbcClient;
+    private final AtomicInteger invocations = new AtomicInteger();
+    private volatile boolean unavailable;
+
+    public StubAuthorProfileClient(JdbcClient jdbcClient) {
+        this.jdbcClient = jdbcClient;
+    }
+
+    @Override
+    public ApiResponse<List<AuthorProfileDto>> profiles(String ids) {
+        invocations.incrementAndGet();
+        if (unavailable) {
+            throw new IllegalStateException("stub: user service unavailable");
+        }
+        List<UUID> parsed = Arrays.stream(ids.split(",")).map(UUID::fromString).toList();
+        List<AuthorProfileDto> profiles = jdbcClient.sql("""
+                        SELECT id, COALESCE(nickname, username::text) AS nickname, avatar_asset_id
+                        FROM identity.users
+                        WHERE id IN (:ids) AND deleted_at IS NULL
+                        """)
+                .param("ids", parsed)
+                .query((rs, rowNum) -> new AuthorProfileDto(
+                        rs.getObject("id", UUID.class),
+                        rs.getString("nickname"),
+                        rs.getObject("avatar_asset_id", UUID.class)))
+                .list();
+        return ApiResponse.success(profiles);
+    }
+
+    public void setUnavailable(boolean value) {
+        this.unavailable = value;
+    }
+
+    public int invocationCount() {
+        return invocations.get();
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/support/StubAuthorProfileConfig.java

@@ -0,0 +1,22 @@
+package com.patbond.patbond.community.support;
+
+import org.springframework.boot.test.context.TestConfiguration;
+import org.springframework.context.annotation.Bean;
+import org.springframework.context.annotation.Primary;
+import org.springframework.jdbc.core.simple.JdbcClient;
+
+/**
+ * Replaces the AuthorProfileClient Feign proxy with the DB-backed stub for
+ * the shared post/feed test context. The Feign machinery itself (URL, token
+ * interceptor, envelope decoding) is exercised separately by
+ * AuthorProfileClientWireTest against a real HTTP server.
+ */
+@TestConfiguration(proxyBeanMethods = false)
+public class StubAuthorProfileConfig {
+
+    @Bean
+    @Primary
+    public StubAuthorProfileClient stubAuthorProfileClient(JdbcClient jdbcClient) {
+        return new StubAuthorProfileClient(jdbcClient);
+    }
+}

patbond-community/src/test/java/com/patbond/patbond/community/support/TestJwtKeys.java

@@ -0,0 +1,59 @@
+package com.patbond.patbond.community.support;
+
+import io.jsonwebtoken.Jwts;
+
+import java.security.KeyPair;
+import java.security.KeyPairGenerator;
+import java.security.NoSuchAlgorithmException;
+import java.security.PrivateKey;
+import java.time.Duration;
+import java.time.Instant;
+import java.util.Base64;
+import java.util.Date;
+import java.util.UUID;
+
+/**
+ * Runtime-generated RSA material for JWT tests. Nothing here is committed
+ * key material (git-workflow: no credentials in the repository) — every test
+ * run mints a fresh pair and injects the public key via
+ * {@code @DynamicPropertySource}.
+ */
+public final class TestJwtKeys {
+
+    public static final KeyPair KEY_PAIR = generate();
+    /** A second pair, for signing tokens the service must reject. */
+    public static final KeyPair WRONG_KEY_PAIR = generate();
+
+    private TestJwtKeys() {
+    }
+
+    public static String publicPem() {
+        return "-----BEGIN PUBLIC KEY-----\n"
+                + Base64.getEncoder().encodeToString(KEY_PAIR.getPublic().getEncoded())
+                + "\n-----END PUBLIC KEY-----";
+    }
+
+    /** Signs an access token the way patbond-auth does (sub/jti/sid/iat/exp). */
+    public static String accessToken(PrivateKey key, UUID userId, Duration ttl) {
+        Instant now = Instant.now();
+        return Jwts.builder()
+                .id(UUID.randomUUID().toString())
+                .subject(userId.toString())
+                .issuer("patbond-auth")
+                .claim("sid", UUID.randomUUID().toString())
+                .issuedAt(Date.from(now))
+                .expiration(Date.from(now.plus(ttl)))
+                .signWith(key, Jwts.SIG.RS256)
+                .compact();
+    }
+
+    private static KeyPair generate() {
+        try {
+            KeyPairGenerator generator = KeyPairGenerator.getInstance("RSA");
+            generator.initialize(2048);
+            return generator.generateKeyPair();
+        } catch (NoSuchAlgorithmException e) {
+            throw new IllegalStateException(e);
+        }
+    }
+}

patbond-community/src/test/resources/application.yml

@@ -0,0 +1,15 @@
+# Test-only configuration: keeps @SpringBootTest deterministic on a clean
+# checkout, where the git-ignored main application.yml does not exist. The
+# datasource comes from Testcontainers (@ServiceConnection).
+spring:
+  application:
+    name: patbond-community
+
+patbond:
+  # Feign client wiring must resolve at context start. Author-profile tests
+  # either replace the client bean with a DB-backed stub or (the wire test)
+  # override this URL with an in-test HTTP server; nothing ever calls this
+  # unroutable address.
+  user-service:
+    url: http://127.0.0.1:1
+  internal-token: test-internal-token