docs: 迁入第一迭代过程报告并建立进展看板

- 新增 development/iterations/iteration-1/：15 份角色报告 + 进展看板（已完成/未闭环/下一步），作为双人协作的进度事实来源
- 新增 ADR-006：测试与交付容器化策略（Testcontainers / 交付 Docker 包 / 本机库仅个人联调）
- Git 工作流规范补充：敏感信息只进忽略文件或 sample、测试数据不入库、测试代码限标准测试目录
- 门禁：mkdocs build --strict 通过（零警告）

mkdocs.yml

@@ -6,5 +6,22 @@ nav:
   - 开发文档:
       - 开发实施计划: development/development-plan.md
       - Git 工作流规范: development/git-workflow.md
+      - 第一迭代:
+          - 进展看板: development/iterations/iteration-1/index.md
+          - 01 任务分解: development/iterations/iteration-1/01-pm-task-breakdown.md
+          - 02 技术评估: development/iterations/iteration-1/02-dev-technical-assessment.md
+          - 03 现状核实: development/iterations/iteration-1/03-reality-check.md
+          - 04 登录 UI 设计规范: development/iterations/iteration-1/04-ui-login-design-spec.md
+          - 05 埋点规划: development/iterations/iteration-1/05-experiment-tracking-plan.md
+          - 06 质量审计: development/iterations/iteration-1/06-evidence-audit.md
+          - 07 后端基线改造报告: development/iterations/iteration-1/07-backend-baseline-report.md
+          - 08 Flutter 主题迁移报告: development/iterations/iteration-1/08-flutter-theme-report.md
+          - 09 任务板更新: development/iterations/iteration-1/09-pm-board-update.md
+          - 10 持久化纵切报告: development/iterations/iteration-1/10-backend-persistence-report.md
+          - 11 第一波复核: development/iterations/iteration-1/11-reality-recheck.md
+          - 12 UI QA 与登录组装稿: development/iterations/iteration-1/12-ui-design-qa-and-assembly.md
+          - 13 埋点实现规范: development/iterations/iteration-1/13-tracking-implementation-spec.md
+          - 14 里程碑证据档案: development/iterations/iteration-1/14-evidence-milestone-dossier.md
+          - 15 Git 收尾报告: development/iterations/iteration-1/15-git-workflow-report.md
   - 架构:
       - 技术决策记录: architecture/decisions.md