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.Infrastructure/HealthArchives/EfHealthArchiveRepository.cs

@@ -7,7 +7,9 @@ public sealed class EfHealthArchiveRepository(AppDbContext db) : IHealthArchiveR
     private readonly AppDbContext _db = db;
 
     public Task<HealthArchive?> GetByUserIdAsync(Guid userId, CancellationToken ct) =>
-        _db.HealthArchives.FirstOrDefaultAsync(a => a.UserId == userId, ct);
+        _db.HealthArchives
+            .Include(a => a.Surgeries)
+            .FirstOrDefaultAsync(a => a.UserId == userId, ct);
 
     public async Task AddAsync(HealthArchive archive, CancellationToken ct) =>
         await _db.HealthArchives.AddAsync(archive, ct);