docs(architecture): 新增后端模块结构与职责速览页

四模块（common/auth/user/pet）职责、端口、单迁移链纪律、演进方向（微服务化/M5 FK 补回/media 域）一页速览，挂「架构」导航首位，作为后端结构唯一权威入口。 Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
2026-09-07 17:25:55 +08:00
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@@ -46,4 +46,5 @@ nav:
  - API:
      - 契约说明: api/index.md
  - 架构:
+      - 后端模块结构与职责: architecture/backend-modules.md
      - 技术决策记录: architecture/decisions.md