feat: 应用内通知系统 + 结构化手术史/用药等相关改动

- 新增用户通知 outbox 流水线(EfUserNotificationPipeline)与后台投递 worker
- 通知中心页面及前端通知服务接入
- 健康指标异常、用药/运动提醒等事件统一产出站内通知
- 健康档案结构化手术史、用药提醒扫描、医生/用户端点等配套调整
- AppDbContext 注册通知相关实体

health_app/lib/pages/home/widgets/chat_messages_view.dart

@@ -1464,13 +1464,13 @@ class ChatMessagesView extends ConsumerWidget {
         ? '${bp['systolic'] ?? '--'}/${bp['diastolic'] ?? '--'}'
         : null;
     final hr = healthData['HeartRate'];
-    final hrText = hr is int ? '$hr' : null;
-    final bs = healthData['BloodSugar'];
-    final bsText = bs is num ? '$bs' : null;
-    final bo = healthData['BloodOxygen'];
-    final boText = bo is num ? '$bo' : null;
+    final hrText = hr is Map && hr['value'] is num ? '${hr['value']}' : null;
+    final bs = healthData['Glucose'];
+    final bsText = bs is Map && bs['value'] is num ? '${bs['value']}' : null;
+    final bo = healthData['SpO2'];
+    final boText = bo is Map && bo['value'] is num ? '${bo['value']}' : null;
     final wt = healthData['Weight'];
-    final wtText = wt is num ? '$wt' : null;
+    final wtText = wt is Map && wt['value'] is num ? '${wt['value']}' : null;
     final allNull =
         bpText == null &&
         hrText == null &&