feat: 二级页面色彩刷新 + 用药/通知/设备重构 + 后端健康档案/通知管线增强 + 大量测试

## 后端
- 健康档案: 新增手术状态字段 + EF 迁移; HealthArchiveService 新增查询方法
- 健康记录: HealthRecordService 新增批量/统计方法; 契约扩展
- 用药: 新增 MedicationScheduleStatus 枚举; MedicationService 排班逻辑调整
- 通知: EfUserNotificationPipeline 重构; 新增 EfReminderCatchUpService; 通知管线支持更多场景
- 用户: UserService 账号删除逻辑; 新增 local_account_file_cleanup; EfUserRepository 扩展
- AI: medication_agent_handler 微调; prompt_manager 优化; AiConversationService 上下文处理
- Endpoint: doctor/medication/exercise/health/notification/user 等多接口调整
- BackgroundService: health_record_reminder_service 重构, 提醒补漏逻辑
- 测试: 新增 account_deletion/doctor_endpoint/medication_schedule/medication_update/prompt_manager 测试

## 前端
- UI 系统: app_theme 大幅重构; app_colors/app_design_tokens/app_module_visuals 调整; 二级页面色彩刷新
- 主页: home_page 背景渐变 + 消息列表提取 _HomeMessages + 通知检查逻辑; chat_messages_view 全面重构
- 用药: medication_list/edit/checkin 三页重构, 新增 medication_ui_logic 抽取
- 通知: notification_prefs_page 重构, 新增 notification_prefs_logic; notification_center 优化
- 设备: device_management 重构, 新增 device_sync_ui_logic; device_scan 优化
- 趋势图: trend_page 大幅重构
- 登录: login_page 重构
- 个人资料: 新增 profile_edit_page; profile_page 优化
- 运动: 新增 exercise/ 目录 + care_plan_ui_logic
- 其他: remaining_pages/report_pages/health_drawer/admin/doctor 等多页面调整
- 组件: common_widgets/app_empty_state/app_error_state/app_future_view/app_toast/ai_content 优化
- Provider: chat_provider/consultation_provider/data_providers/auth_provider 调整
- AndroidManifest: 移除多余权限
- 测试: 新增 ai_content/care_plan/home_message/login_flow/medication_checkin/medication_ui/notification_prefs/profile_device/secondary_page/swipe_delete 等大量测试

## 文档
- 新增 ui-design-system.md 设计系统文档
- 新增 secondary-page-color-refresh 计划 + specs 目录

health_app/lib/pages/doctor/doctor_followup_edit_page.dart

@@ -62,7 +62,7 @@ class _DoctorFollowUpEditPageState
     return Scaffold(
       backgroundColor: AppColors.background,
       appBar: AppBar(
-        backgroundColor: Colors.white,
+        backgroundColor: Colors.transparent,
         elevation: 0,
         surfaceTintColor: Colors.transparent,
         title: Text(

health_app/lib/pages/doctor/doctor_home_page.dart

@@ -23,7 +23,7 @@ class DoctorHomePage extends ConsumerWidget {
       child: Scaffold(
         backgroundColor: AppColors.background,
         appBar: AppBar(
-          backgroundColor: Colors.white,
+          backgroundColor: Colors.transparent,
           elevation: 0,
           surfaceTintColor: Colors.transparent,
           title: Text(

health_app/lib/pages/doctor/doctor_patient_detail_page.dart

@@ -21,7 +21,7 @@ class DoctorPatientDetailPage extends ConsumerWidget {
     return Scaffold(
       backgroundColor: AppColors.background,
       appBar: AppBar(
-        backgroundColor: Colors.white,
+        backgroundColor: Colors.transparent,
         elevation: 0,
         surfaceTintColor: Colors.transparent,
         title: const Text(
@@ -125,11 +125,13 @@ class DoctorPatientDetailPage extends ConsumerWidget {
                     (archive['surgeries'] as List).isNotEmpty)
                   _row(
                     '手术史',
-                    (archive['surgeries'] as List).map((item) {
-                      final surgery = item as Map;
-                      final date = surgery['date']?.toString() ?? '';
-                      return '${surgery['type'] ?? ''}${date.isEmpty ? '' : ' $date'}';
-                    }).join('；'),
+                    (archive['surgeries'] as List)
+                        .map((item) {
+                          final surgery = item as Map;
+                          final date = surgery['date']?.toString() ?? '';
+                          return '${surgery['type'] ?? ''}${date.isEmpty ? '' : ' $date'}';
+                        })
+                        .join('；'),
                   )
                 else if (archive['surgeryType'] != null)
                   _row(

health_app/lib/pages/doctor/doctor_profile_page.dart

@@ -40,7 +40,7 @@ class _DoctorProfileEditPageState extends ConsumerState<DoctorProfileEditPage> {
     return Scaffold(
       backgroundColor: AppColors.background,
       appBar: AppBar(
-        backgroundColor: Colors.white,
+        backgroundColor: Colors.transparent,
         elevation: 0,
         surfaceTintColor: Colors.transparent,
         title: const Text(

health_app/lib/pages/doctor/doctor_report_detail_page.dart

@@ -90,7 +90,7 @@ class _DoctorReportDetailPageState
     return Scaffold(
       backgroundColor: AppColors.background,
       appBar: AppBar(
-        backgroundColor: Colors.white,
+        backgroundColor: Colors.transparent,
         elevation: 0,
         surfaceTintColor: Colors.transparent,
         title: const Text(
@@ -298,8 +298,12 @@ class _DoctorReportDetailPageState
             width: double.infinity,
             child: OutlinedButton.icon(
               onPressed: () {
-              pushRoute(ref, 'reportOriginal', params: {'url': fileUrl, 'title': '原始报告'});
-            },
+                pushRoute(
+                  ref,
+                  'reportOriginal',
+                  params: {'url': fileUrl, 'title': '原始报告'},
+                );
+              },
               icon: const Icon(Icons.visibility, size: 18),
               label: const Text('查看原始报告'),
               style: OutlinedButton.styleFrom(

health_app/lib/pages/doctor/doctor_settings_page.dart

@@ -11,7 +11,7 @@ class DoctorSettingsPage extends ConsumerWidget {
     return Scaffold(
       backgroundColor: AppColors.background,
       appBar: AppBar(
-        backgroundColor: Colors.white,
+        backgroundColor: Colors.transparent,
         elevation: 0,
         surfaceTintColor: Colors.transparent,
         title: const Text('设置', style: TextStyle(color: AppColors.textPrimary)),
@@ -28,8 +28,20 @@ class DoctorSettingsPage extends ConsumerWidget {
             '推送通知',
             trailing: Switch(value: true, onChanged: (_) {}),
           ),
-          _SettingTile(Icons.description_outlined, '隐私政策', onTap: () { pushRoute(ref, 'staticText', params: {'type': 'privacy'}); }),
-          _SettingTile(Icons.article_outlined, '用户协议', onTap: () { pushRoute(ref, 'staticText', params: {'type': 'terms'}); }),
+          _SettingTile(
+            Icons.description_outlined,
+            '隐私政策',
+            onTap: () {
+              pushRoute(ref, 'staticText', params: {'type': 'privacy'});
+            },
+          ),
+          _SettingTile(
+            Icons.article_outlined,
+            '用户协议',
+            onTap: () {
+              pushRoute(ref, 'staticText', params: {'type': 'terms'});
+            },
+          ),
           const SizedBox(height: 24),
           _SettingTile(
             Icons.delete_forever_outlined,