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

health_app/lib/core/api_client.dart

@@ -9,7 +9,7 @@ const String baseUrl = String.fromEnvironment(
   'API_BASE_URL',
   defaultValue: kReleaseMode
       ? 'https://erpapi.datalumina.cn/xiaomai'
-      : 'http://10.4.237.12:5000',
+      : 'http://10.4.159.130:5000',
 );
 
 class ApiException implements Exception {

health_app/lib/core/app_router.dart

@@ -57,7 +57,14 @@ Widget buildPage(RouteInfo route, WidgetRef ref) {
     case 'adminHome':
       return const AdminHomePage();
     case 'adminAddDoctor':
-      return const AdminAddDoctorPage();
+      return AdminAddDoctorPage(
+        id: params['id'],
+        initialPhone: params['phone'] ?? '',
+        initialName: params['name'] ?? '',
+        initialTitle: params['title'] ?? '',
+        initialDepartment: params['department'] ?? '',
+        initialDirection: params['direction'] ?? '',
+      );
     case 'trend':
       return TrendPage(
         metricType: params['type']?.isNotEmpty == true ? params['type'] : null,
@@ -109,8 +116,7 @@ Widget buildPage(RouteInfo route, WidgetRef ref) {
       final id = _requiredParam(params, 'id');
       return id == null ? _missingParamPage() : DoctorReportDetailPage(id: id);
     case 'doctorFollowUpEdit':
-      final id = _requiredParam(params, 'id');
-      return id == null ? _missingParamPage() : DoctorFollowUpEditPage(id: id);
+      return DoctorFollowUpEditPage(id: params['id']);
     case 'devices':
       return const DeviceManagementPage();
     case 'deviceScan':