feat: 引入 EF Core Migrations + 后台任务/校验修复 + 前端四态

后端
- 改用 EF Core Migrations(InitialCreate),Program.cs 用 MigrateAsync + AUTO_MIGRATE 开关 + 显式 MigrationsAssembly;移除 EnsureCreated、删除手写 DatabaseSchemaMigrator
- 修复后台任务永久卡 Processing:三个队列对超时且达上限的任务原子标记 Failed
- 修复报告重试失效:基础设施异常向上抛激活 RetryAsync,停机取消不计失败
- 修复 AI 用药天数 off-by-one(结束日为包含式)
- AI 报告日志不再记录 VLM 健康正文
- 新增统一输入校验(ValidationException + 中间件映射 400):血压/心率/血糖/血氧/体重范围、药名/日期/服药时间去重、饮食热量与评分、运动时长上限
- 删除健康数据 AI 录入的影子直写路径,统一走 Service 校验

前端
- 新增 AppErrorState / AppFutureView,用药列表、服药打卡、运动计划、随访列表改为 加载/失败/空/数据 四态,失败可重试

瘦身
- 删除过时的 DataSeeder / DevDataSeeder 及调用
- 删除依赖实时服务的 ai_agent_tests 集成测试

backend/src/Health.WebApi/Program.cs

@@ -79,7 +79,9 @@ builder.Services.ConfigureHttpJsonOptions(options =>
 
 // ---- 数据库 ----
 builder.Services.AddDbContext<AppDbContext>(options =>
-    options.UseNpgsql(builder.Configuration.GetConnectionString("Default") ?? builder.Configuration["DB_CONNECTION"] ?? "Host=localhost;Database=health_manager;Username=postgres;Password=postgres"));
+    options.UseNpgsql(
+        builder.Configuration.GetConnectionString("Default") ?? builder.Configuration["DB_CONNECTION"] ?? "Host=localhost;Database=health_manager;Username=postgres;Password=postgres",
+        npgsql => npgsql.MigrationsAssembly(typeof(AppDbContext).Assembly.FullName)));
 
 // ---- JWT 认证 ----
 var jwtSecret = builder.Configuration["JWT_SECRET"];
@@ -137,6 +139,8 @@ builder.Services.AddScoped<IMaintenanceService, MaintenanceService>();
 builder.Services.AddScoped<IMaintenanceRepository, EfMaintenanceRepository>();
 builder.Services.AddScoped<IInAppNotificationService, InAppNotificationService>();
 builder.Services.AddScoped<IInAppNotificationRepository, EfInAppNotificationRepository>();
+builder.Services.AddScoped<IUserNotificationProducer, EfUserNotificationProducer>();
+builder.Services.AddScoped<INotificationOutboxProcessor, EfNotificationOutboxProcessor>();
 builder.Services.AddScoped<IReportService, ReportService>();
 builder.Services.AddScoped<IReportRepository, EfReportRepository>();
 builder.Services.AddScoped<IReportFileStorage, LocalReportFileStorage>();
@@ -144,7 +148,6 @@ builder.Services.AddScoped<IReportAnalysisService, ReportAnalysisService>();
 builder.Services.AddScoped<IReportAnalysisQueue, EfReportAnalysisQueue>();
 builder.Services.AddScoped<IUserService, UserService>();
 builder.Services.AddScoped<IUserRepository, EfUserRepository>();
-builder.Services.AddScoped<DatabaseSchemaMigrator>();
 
 // ---- AI 客户端（使用 IHttpClientFactory 区分 LLM 和 VLM）----
 builder.Services.AddHttpClient<DeepSeekClient>(client =>
@@ -167,6 +170,7 @@ builder.Services.AddHostedService<MedicationReminderWorker>();
 builder.Services.AddHostedService<CleanupService>();
 builder.Services.AddHostedService<ReportAnalysisWorker>();
 builder.Services.AddHostedService<DietImageAnalysisWorker>();
+builder.Services.AddHostedService<NotificationOutboxWorker>();
 
 // ---- OpenAPI ----
 builder.Services.AddOpenApi();
@@ -202,14 +206,12 @@ app.UseStaticFiles(new StaticFileOptions
 if (app.Environment.IsDevelopment())
     app.MapOpenApi();
 
-// ---- 初始化数据库：创建空库，并用版本化补丁更新已有本地结构 ----
+// ---- 数据库迁移（EF Core Migrations，可用 AUTO_MIGRATE=false 禁用自动迁移）----
 using (var scope = app.Services.CreateScope())
 {
     var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
-    await db.Database.EnsureCreatedAsync();
-    await scope.ServiceProvider.GetRequiredService<DatabaseSchemaMigrator>().ApplyAsync();
-    await DataSeeder.SeedAsync(db);
-    await DevDataSeeder.SeedIfEnabled(db, app.Configuration);
+    if (app.Configuration.GetValue<bool>("AUTO_MIGRATE", true))
+        await db.Database.MigrateAsync();
 }
 
 // ---- 注册 API 端点 ----