docs: 按功能模块重构文档结构

- 新建 01-架构设计.md:合并项目概述+系统架构+持久化设计,含 Mermaid 架构图、模块图、时序图、ER 图、部署图
- 新建 02-接口文档.md:合并接口文档+持久化 API+用户模块 API,统一格式去重
- 重编号 03~09,去掉状态标注,规划中功能标记为待实现
- 删除 PLAN_BACKEND.md、PLAN_USER_MODULE.md 及冗余文档
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hhs
2026-06-19 15:31:52 +08:00
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