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/test/care_plan_ui_logic_test.dart

@@ -0,0 +1,86 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:health_app/pages/care_plan_ui_logic.dart';
+
+void main() {
+  group('care plan lifecycle', () {
+    final today = DateTime(2026, 7, 13);
+
+    test('separates active, upcoming, and ended records', () {
+      expect(
+        resolveCarePlanPhase(
+          startDate: '2026-07-01',
+          endDate: '2026-07-20',
+          today: today,
+        ),
+        CarePlanPhase.active,
+      );
+      expect(
+        resolveCarePlanPhase(
+          startDate: '2026-07-14',
+          endDate: '2026-07-20',
+          today: today,
+        ),
+        CarePlanPhase.upcoming,
+      );
+      expect(
+        resolveCarePlanPhase(
+          startDate: '2026-06-01',
+          endDate: '2026-07-12',
+          today: today,
+        ),
+        CarePlanPhase.ended,
+      );
+    });
+
+    test('disabled medication is treated as ended', () {
+      expect(
+        resolveCarePlanPhase(
+          enabled: false,
+          startDate: '2026-07-01',
+          endDate: '2026-07-20',
+          today: today,
+        ),
+        CarePlanPhase.ended,
+      );
+    });
+  });
+
+  group('medication form validation', () {
+    test('requires dosage', () {
+      expect(
+        validateMedicationForm(
+          name: '阿司匹林',
+          dosage: '',
+          times: const ['08:00'],
+          startDate: DateTime(2026, 7, 13),
+        ),
+        '请输入服药剂量',
+      );
+    });
+
+    test('rejects duplicate dose times', () {
+      expect(
+        validateMedicationForm(
+          name: '阿司匹林',
+          dosage: '100mg',
+          times: const ['08:00', '08:00'],
+          startDate: DateTime(2026, 7, 13),
+        ),
+        '服药时间不能重复',
+      );
+    });
+
+    test('rejects an end date before the start date', () {
+      expect(
+        validateMedicationForm(
+          name: '阿司匹林',
+          dosage: '100mg',
+          times: const ['08:00'],
+          startDate: DateTime(2026, 7, 13),
+          endDate: DateTime(2026, 7, 12),
+        ),
+        '结束日期不能早于开始日期',
+      );
+    });
+  });
+}