feat: 后台管理页全量重构 + backoffice 共享模块 + 启动脚本优化

## 后台管理页重构
- admin 端: add_doctor / doctors / home / patients 四页重构
- doctor 端: consultations / dashboard / followup_edit / followups / home / patient_detail / patients / profile / report_detail / reports / settings 十一页重构
- 新增 backoffice 共享模块: backoffice_refresh_providers + backoffice_formatters + backoffice_ui

## 后端
- AdminService 增强(分页/搜索/统计)
- doctor_endpoints 微调
- appsettings.Development 调整
- 新增 admin_service_tests

## 前端其他
- 今日健康卡片 taskRow 行高 5->7(每行 44->48px)
- 健康仪表盘配色定 #4FACFE 纯色蓝
- admin_drawer / doctor_drawer 微调
- api_client IP 适配

## 启动脚本
- start-dev.bat: 加后端就绪检测(轮询 openapi 端点, 最多等 30s)

## 清理
- 删除旧品牌图(agent_welcome_abstract / login_background_v1)
- 删除 app_status_badge 组件
- 删除旧 HANDOFF 文档, 新增 07-17 版

## 测试
- 新增 backoffice_formatters / backoffice_refresh / backoffice_ui 三个测试
- app_router_test 扩展

start-dev.bat

@@ -16,8 +16,26 @@ echo.
 
 echo [2/2] Starting .NET Backend...
 start "Backend" cmd /k "cd /d D:\health_project\backend\src\Health.WebApi && dotnet run"
-echo   Waiting for backend...
-timeout /t 8 /nobreak >nul
+echo   Waiting for backend readiness...
+set /a BACKEND_WAIT_SECONDS=0
+
+:wait_backend
+powershell -NoProfile -NonInteractive -Command "try { $response = Invoke-WebRequest -UseBasicParsing -Uri 'http://127.0.0.1:5000/openapi/v1.json' -TimeoutSec 2; if ($response.StatusCode -eq 200) { exit 0 } } catch {}; exit 1" >nul 2>&1
+if not errorlevel 1 goto backend_ready
+set /a BACKEND_WAIT_SECONDS+=1
+if %BACKEND_WAIT_SECONDS% GEQ 30 goto backend_failed
+timeout /t 1 /nobreak >nul
+goto wait_backend
+
+:backend_failed
+echo.
+echo ERROR: Backend failed to become ready within 30 seconds.
+echo Check the Backend window for the detailed error.
+pause
+exit /b 1
+
+:backend_ready
+echo   Backend is ready at http://127.0.0.1:5000
 echo.
 
 echo All done. Phone connects via WiFi to this PC.