fix: 全面修复 - 实时通讯、报告AI流程、健康概览、用药运动提醒

- SignalR Hub消息持久化+防重复+跨端广播
- 报告VLM+LLM真实AI流程(验证→提取→解读)
- 医生审核页重构(严重程度/建议模板/综合评语)
- 健康概览五合一趋势图(fl_chart+指标切换)
- 用药提醒时区修复+跨午夜+过期提醒
- 运动打卡DayOfWeek映射修复+计划覆盖查询
- 体重与其他四指标同级(Abnormal检查/确认卡牌)
- AI Agent支持多种类多时段批量录入
- 删除硬编码假数据(张三/假医生/假AI解读)
- 随访/报告审核数据链路全部打通

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

@@ -34,13 +34,15 @@ public sealed class MedicationReminderService(IServiceScopeFactory scopeFactory,
         // 使用北京时间（UTC+8）
         var beijingNow = DateTime.UtcNow.AddHours(8);
         var beijingTime = TimeOnly.FromDateTime(beijingNow);
-        var today = DateOnly.FromDateTime(beijingNow);
+        var todayStart = DateTime.SpecifyKind(beijingNow.Date, DateTimeKind.Utc);
 
         // 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（防止服务重启错过提醒）
+        // 处理跨午夜情况
         var windowStart = beijingTime.AddMinutes(-5);
         var medications = await db.Medications
             .Where(m => m.IsActive)
-            .Where(m => m.TimeOfDay.Any(t => t >= windowStart && t <= beijingTime))
+            .Where(m => m.TimeOfDay.Any(t =>
+                beijingTime > windowStart ? (t >= windowStart && t <= beijingTime) : (t >= windowStart || t <= beijingTime)))
             .ToListAsync(ct);
 
         foreach (var med in medications)
@@ -48,7 +50,7 @@ public sealed class MedicationReminderService(IServiceScopeFactory scopeFactory,
             // 检查今天是否已打卡
             var alreadyLogged = await db.MedicationLogs
                 .AnyAsync(l => l.MedicationId == med.Id
-                    && l.CreatedAt.Date == beijingNow.Date
+                    && l.CreatedAt >= todayStart
                     && l.Status == MedicationLogStatus.Taken, ct);
 
             if (alreadyLogged) continue;