feat: 初始化孕育无忧全栈项目基础代码结构

完成项目初始搭建，包含后端FastAPI+MongoDB服务、前端React+Vite项目的完整基础结构，添加各类配置文件与依赖清单，涵盖核心业务初始框架。

backend/app/routers/__init__.py

@@ -0,0 +1,9 @@
+from app.routers.auth import router as auth_router
+from app.routers.user import router as user_router
+from app.routers.report import router as report_router
+from app.routers.analysis import router as analysis_router
+from app.routers.chat import router as chat_router
+from app.routers.health_records import router as health_records_router
+from app.routers.calendar import router as calendar_router
+from app.routers.doctor import router as doctor_router
+from app.routers.share import router as share_router