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

backend/src/Health.Domain/Entities/support_entities.cs

@@ -38,6 +38,18 @@ public sealed class HealthArchive
     public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
 
     public User User { get; set; } = null!;
+    public ICollection<HealthArchiveSurgery> Surgeries { get; set; } = [];
+}
+
+public sealed class HealthArchiveSurgery
+{
+    public Guid Id { get; set; }
+    public Guid HealthArchiveId { get; set; }
+    public string Type { get; set; } = string.Empty;
+    public DateOnly? Date { get; set; }
+    public int SortOrder { get; set; }
+
+    public HealthArchive HealthArchive { get; set; } = null!;
 }
 
 /// <summary>
@@ -97,3 +109,20 @@ public sealed class DeviceToken
 
     public User User { get; set; } = null!;
 }
+
+public sealed class UserNotification
+{
+    public Guid Id { get; set; }
+    public Guid UserId { get; set; }
+    public Guid SourceId { get; set; }
+    public string Type { get; set; } = string.Empty;
+    public string Title { get; set; } = string.Empty;
+    public string Message { get; set; } = string.Empty;
+    public string Severity { get; set; } = "info";
+    public string? ActionType { get; set; }
+    public string? ActionTargetId { get; set; }
+    public bool IsRead { get; set; }
+    public DateTime? ReadAt { get; set; }
+    public bool IsDeleted { get; set; }
+    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
+}