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/device/device_scan_page.dart

@@ -7,6 +7,7 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:permission_handler/permission_handler.dart';
 
 import '../../core/app_colors.dart';
+import '../../core/app_design_tokens.dart';
 import '../../core/app_theme.dart';
 import '../../core/navigation_provider.dart';
 import '../../models/ble_device.dart';
@@ -290,8 +291,6 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
   Widget build(BuildContext context) {
     return GradientScaffold(
       appBar: AppBar(
-        backgroundColor: Colors.white.withValues(alpha: 0.92),
-        elevation: 0,
         title: const Text(
           '新增设备',
           style: TextStyle(color: AppColors.textPrimary),
@@ -303,19 +302,30 @@ class _DeviceScanPageState extends ConsumerState<DeviceScanPage>
       ),
       body: _results.isEmpty
           ? _ScanningEmpty(animation: _pulseAnim, scanning: _scanning)
-          : ListView.separated(
+          : ListView(
               padding: const EdgeInsets.fromLTRB(16, 12, 16, 20),
-              itemCount: _results.length,
-              separatorBuilder: (context, index) => const SizedBox(height: 10),
-              itemBuilder: (context, index) {
-                final result = _results[index];
-                return _DeviceResultTile(
-                  result: result,
-                  connecting:
-                      _connectingId == result.device.remoteId.toString(),
-                  onConnect: () => _connectBindAndSync(result),
-                );
-              },
+              children: [
+                ClipRRect(
+                  borderRadius: AppRadius.lgBorder,
+                  child: ColoredBox(
+                    color: Colors.white,
+                    child: Column(
+                      children: [
+                        for (var index = 0; index < _results.length; index++)
+                          _DeviceResultTile(
+                            result: _results[index],
+                            connecting:
+                                _connectingId ==
+                                _results[index].device.remoteId.toString(),
+                            showDivider: index < _results.length - 1,
+                            onConnect: () =>
+                                _connectBindAndSync(_results[index]),
+                          ),
+                      ],
+                    ),
+                  ),
+                ),
+              ],
             ),
     );
   }
@@ -413,11 +423,13 @@ class _ScanningEmpty extends StatelessWidget {
 class _DeviceResultTile extends StatelessWidget {
   final ScanResult result;
   final bool connecting;
+  final bool showDivider;
   final VoidCallback onConnect;
 
   const _DeviceResultTile({
     required this.result,
     required this.connecting,
+    required this.showDivider,
     required this.onConnect,
   });
 
@@ -425,23 +437,16 @@ class _DeviceResultTile extends StatelessWidget {
   Widget build(BuildContext context) {
     final type = HealthBleService.deviceTypeFromScan(result);
     final name = _deviceNameOf(result, type);
-    return Container(
-      padding: const EdgeInsets.all(15),
-      decoration: BoxDecoration(
-        color: Colors.white,
-        borderRadius: BorderRadius.circular(16),
-        border: Border.all(color: AppColors.border, width: 1.1),
-        boxShadow: [AppTheme.shadowLight],
-      ),
+    return Padding(
+      padding: const EdgeInsets.only(left: 14),
       child: Row(
         children: [
           Container(
-            width: 48,
-            height: 48,
+            width: 42,
+            height: 42,
             decoration: BoxDecoration(
               color: AppColors.deviceLight,
-              borderRadius: BorderRadius.circular(14),
-              border: Border.all(color: AppColors.deviceBorder),
+              borderRadius: AppRadius.smBorder,
             ),
             child: Icon(
               type?.icon ?? Icons.bluetooth_rounded,
@@ -449,52 +454,76 @@ class _DeviceResultTile extends StatelessWidget {
               size: 25,
             ),
           ),
-          const SizedBox(width: 14),
+          const SizedBox(width: 12),
           Expanded(
-            child: Column(
-              crossAxisAlignment: CrossAxisAlignment.start,
-              children: [
-                Text(
-                  type?.label ?? '健康设备',
-                  style: const TextStyle(
-                    fontSize: 18,
-                    fontWeight: FontWeight.w800,
-                    color: AppColors.textPrimary,
-                  ),
-                ),
-                const SizedBox(height: 4),
-                Text(
-                  name,
-                  maxLines: 1,
-                  overflow: TextOverflow.ellipsis,
-                  style: const TextStyle(
-                    fontSize: 14,
-                    color: AppColors.textHint,
-                  ),
-                ),
-              ],
-            ),
-          ),
-          const SizedBox(width: 10),
-          SizedBox(
-            height: 38,
-            child: FilledButton(
-              onPressed: connecting ? null : onConnect,
-              style: FilledButton.styleFrom(
-                backgroundColor: AppColors.device,
-                foregroundColor: Colors.white,
-                disabledBackgroundColor: AppColors.cardInner,
-                disabledForegroundColor: AppColors.textHint,
-                padding: const EdgeInsets.symmetric(horizontal: 14),
-                shape: RoundedRectangleBorder(
-                  borderRadius: BorderRadius.circular(10),
-                ),
-                textStyle: const TextStyle(
-                  fontSize: 14,
-                  fontWeight: FontWeight.w800,
-                ),
+            child: Container(
+              constraints: const BoxConstraints(minHeight: 70),
+              padding: const EdgeInsets.fromLTRB(0, 12, 12, 12),
+              decoration: BoxDecoration(
+                border: showDivider
+                    ? const Border(
+                        bottom: BorderSide(
+                          color: AppColors.divider,
+                          width: 0.7,
+                        ),
+                      )
+                    : null,
+              ),
+              child: Row(
+                children: [
+                  Expanded(
+                    child: Column(
+                      crossAxisAlignment: CrossAxisAlignment.start,
+                      children: [
+                        Text(
+                          type?.label ?? '健康设备',
+                          style: const TextStyle(
+                            fontSize: 17,
+                            fontWeight: FontWeight.w800,
+                            color: AppColors.textPrimary,
+                          ),
+                        ),
+                        const SizedBox(height: 4),
+                        Text(
+                          name,
+                          maxLines: 1,
+                          overflow: TextOverflow.ellipsis,
+                          style: const TextStyle(
+                            fontSize: 13,
+                            color: AppColors.textHint,
+                          ),
+                        ),
+                      ],
+                    ),
+                  ),
+                  const SizedBox(width: 10),
+                  SizedBox(
+                    height: 36,
+                    child: OutlinedButton(
+                      onPressed: connecting ? null : onConnect,
+                      style: OutlinedButton.styleFrom(
+                        backgroundColor: Colors.white,
+                        foregroundColor: AppColors.device,
+                        disabledForegroundColor: AppColors.textHint,
+                        side: BorderSide(
+                          color: connecting
+                              ? AppColors.borderLight
+                              : AppColors.device,
+                        ),
+                        padding: const EdgeInsets.symmetric(horizontal: 13),
+                        shape: RoundedRectangleBorder(
+                          borderRadius: AppRadius.smBorder,
+                        ),
+                        textStyle: const TextStyle(
+                          fontSize: 14,
+                          fontWeight: FontWeight.w800,
+                        ),
+                      ),
+                      child: Text(connecting ? '连接中' : '连接'),
+                    ),
+                  ),
+                ],
               ),
-              child: Text(connecting ? '连接中' : '连接'),
             ),
           ),
         ],
@@ -537,7 +566,7 @@ class _ScanPulse extends StatelessWidget {
           height: 64,
           decoration: BoxDecoration(
             color: Colors.white,
-            borderRadius: BorderRadius.circular(20),
+            borderRadius: AppRadius.xlBorder,
             border: Border.all(color: AppColors.borderLight),
           ),
           child: const Icon(