feat: 新建 patbond-pet 模块骨架（ADR-009，T2-02 前置）

- 新 Maven 模块挂入父 pom，依赖/插件管理对齐既有 user/auth 模式
  （common 依赖、starter-web/validation/jdbc、exec classifier repackage）
- 骨架内容：PetApplication、/health 探活端点（含 DB 连通检查）、
  GlobalExceptionHandler（同一 {code,message,data} 信封契约）
- 与 user 共库只读写 pet_health schema；不携带 Flyway——单一迁移链
  （V1..V4）仍由 patbond-user 启动时统一执行，flyway_schema_history 不拆
- 配置走 .sample 模式（默认端口 8083，敏感信息经环境变量注入不入库）
- compose 编排纳入 pet 服务（依赖 postgres 健康 + user 先起保证迁移就绪）；
  Dockerfile 与既有服务同模式；Readme 模块清单同步
- 测试：Testcontainers postgres:18 上下文启动冒烟 + /health 探活断言

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

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: