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

backend/src/Health.WebApi/BackgroundServices/medication_reminder_service.cs

@@ -1,22 +1,31 @@
+using Health.Application.Medications;
+
 namespace Health.WebApi.BackgroundServices;
 
-/// <summary>
-/// 用药提醒定时扫描服务（每分钟检查一次）
-/// </summary>
-public sealed class MedicationReminderService(IServiceScopeFactory scopeFactory, ILogger<MedicationReminderService> logger) : BackgroundService
+public sealed class MedicationReminderService(
+    IServiceScopeFactory scopeFactory,
+    ILogger<MedicationReminderService> logger) : BackgroundService
 {
     private readonly IServiceScopeFactory _scopeFactory = scopeFactory;
     private readonly ILogger<MedicationReminderService> _logger = logger;
 
     protected override async Task ExecuteAsync(CancellationToken stoppingToken)
     {
-        _logger.LogInformation("用药提醒服务已启动");
-
+        _logger.LogInformation("用药提醒扫描生产者已启动");
         while (!stoppingToken.IsCancellationRequested)
         {
             try
             {
-                await ProcessReminders(stoppingToken);
+                using var scope = _scopeFactory.CreateScope();
+                var scanner = scope.ServiceProvider.GetRequiredService<IMedicationReminderScanner>();
+                var queue = scope.ServiceProvider.GetRequiredService<IMedicationReminderQueue>();
+                var tasks = await scanner.ScanAsync(DateTime.UtcNow, stoppingToken);
+                foreach (var task in tasks)
+                    await queue.EnqueueAsync(task, stoppingToken);
+            }
+            catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
+            {
+                break;
             }
             catch (Exception ex)
             {
@@ -26,37 +35,4 @@ public sealed class MedicationReminderService(IServiceScopeFactory scopeFactory,
             await Task.Delay(TimeSpan.FromMinutes(1), stoppingToken);
         }
     }
-
-    private async Task ProcessReminders(CancellationToken ct)
-    {
-        using var scope = _scopeFactory.CreateScope();
-        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
-        // 北京时间今天0点 → 转为UTC
-        var beijingToday = DateTime.UtcNow.AddHours(8).Date;
-        var todayStartUtc = beijingToday.AddHours(-8);
-
-        // 查询：启用的用药计划 AND 服药时间在当前时间前后5分钟窗口内
-        var beijingTime = TimeOnly.FromDateTime(DateTime.UtcNow.AddHours(8));
-        var windowStart = beijingTime.AddMinutes(-5);
-        var medications = await db.Medications
-            .Where(m => m.IsActive)
-            .Where(m => m.TimeOfDay.Any(t =>
-                beijingTime > windowStart ? (t >= windowStart && t <= beijingTime) : (t >= windowStart || t <= beijingTime)))
-            .ToListAsync(ct);
-
-        foreach (var med in medications)
-        {
-            // 检查今天是否已打卡（用正确的北京时间区间）
-            var alreadyLogged = await db.MedicationLogs
-                .AnyAsync(l => l.MedicationId == med.Id
-                    && l.CreatedAt >= todayStartUtc
-                    && l.Status == MedicationLogStatus.Taken, ct);
-
-            if (alreadyLogged) continue;
-
-            // TODO: 调用极光推送发送用药提醒
-            _logger.LogInformation("用药提醒: 用户 {UserId} 药品 {Name} {Dosage} 时间 {Time}",
-                med.UserId, med.Name, med.Dosage, beijingTime);
-        }
-    }
 }