feat: 后端架构重构 — Endpoint→Service→Repository分层 + AI确认机制 + 异步任务持久化

- 核心业务拆分为 Endpoint → Application Service → Repository 三层
- AI写入操作必须用户确认后才写库(确认卡片机制)
- 报告/饮食/用药分析改为持久化任务队列(原子领取/重试/重启恢复)
- 运动计划修复: 连续真实日期替代周模板
- 用药提醒去重 + 通知Outbox预留
- 认证收拢到AuthService, 管理员收拢到AdminService
- AI会话加用户归属校验防串号
- 提示词调整为患者视角
- 开发假数据已关闭
- 21/21测试通过, 0警告0错误

health_app/lib/pages/home/home_page.dart

@@ -1,4 +1,5 @@
 import 'dart:io';
+import 'dart:async';
 import 'package:flutter/material.dart';
 import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:image_picker/image_picker.dart';
@@ -11,6 +12,7 @@ import '../../providers/auth_provider.dart';
 import '../../providers/chat_provider.dart';
 import '../../providers/data_providers.dart';
 import '../../widgets/health_drawer.dart';
+import '../../services/in_app_notification_service.dart';
 import '../diet/diet_capture_page.dart';
 import 'widgets/chat_messages_view.dart';
 
@@ -26,15 +28,74 @@ class _HomePageState extends ConsumerState<HomePage> {
   final _focusNode = FocusNode();
   String? _pickedImagePath;
   int _lastMsgCount = 0;
+  Timer? _notificationTimer;
+  bool _checkingNotifications = false;
+
+  @override
+  void initState() {
+    super.initState();
+    WidgetsBinding.instance.addPostFrameCallback((_) => _checkNotifications());
+    _notificationTimer = Timer.periodic(
+      const Duration(seconds: 30),
+      (_) => _checkNotifications(),
+    );
+  }
 
   @override
   void dispose() {
+    _notificationTimer?.cancel();
     _textCtrl.dispose();
     _scrollCtrl.dispose();
     _focusNode.dispose();
     super.dispose();
   }
 
+  Future<void> _checkNotifications() async {
+    if (!mounted || _checkingNotifications) return;
+    if (!ref.read(authProvider).isLoggedIn) return;
+    _checkingNotifications = true;
+    try {
+      final service = InAppNotificationService(ref.read(apiClientProvider));
+      final notifications = await service.getPending();
+      for (final notification in notifications) {
+        if (!mounted) return;
+        ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(
+            behavior: SnackBarBehavior.floating,
+            duration: const Duration(seconds: 5),
+            content: Row(
+              children: [
+                Icon(
+                  notification.type == 'ExerciseReminder'
+                      ? Icons.directions_run_outlined
+                      : Icons.medication_outlined,
+                  color: Colors.white,
+                ),
+                const SizedBox(width: 12),
+                Expanded(
+                  child: Column(
+                    mainAxisSize: MainAxisSize.min,
+                    crossAxisAlignment: CrossAxisAlignment.start,
+                    children: [
+                      Text(notification.title,
+                          style: const TextStyle(fontWeight: FontWeight.w700)),
+                      Text(notification.message),
+                    ],
+                  ),
+                ),
+              ],
+            ),
+          ),
+        );
+        await service.acknowledge(notification.id);
+      }
+    } catch (_) {
+      // App 内提醒失败不阻断主页使用，下次轮询会重试。
+    } finally {
+      _checkingNotifications = false;
+    }
+  }
+
   void _sendMessage() {
     final text = _textCtrl.text.trim();
     final imagePath = _pickedImagePath;