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/Endpoints/medication_endpoints.cs

@@ -106,19 +106,28 @@ public static class MedicationEndpoints
         group.MapGet("/reminders", async (HttpContext http, AppDbContext db, CancellationToken ct) =>
         {
             var userId = GetUserId(http);
-            var now = TimeOnly.FromDateTime(DateTime.Now);
-            var windowEnd = now.AddHours(1);
+            var beijingNow = DateTime.UtcNow.AddHours(8);
+            var now = TimeOnly.FromDateTime(beijingNow);
+            var windowFuture = now.AddHours(2);  // 接下来2小时
+            var windowPast = now.AddHours(-1);    // 过去1小时内（过了还没吃就该提醒）
+
             var meds = await db.Medications
                 .Where(m => m.UserId == userId && m.IsActive && m.TimeOfDay != null)
                 .ToListAsync(ct);
-            var due = meds.Where(m => m.TimeOfDay!.Any(t => t >= now && t <= windowEnd)).ToList();
 
-            var today = DateOnly.FromDateTime(DateTime.Now);
+            // 同时包含：未来2小时内 + 过去1小时内（防止过了时间就不提醒）
+            var due = meds.Where(m => m.TimeOfDay!.Any(t =>
+                InTimeWindow(t, now, windowFuture) || InTimeWindow(t, windowPast, now)
+            )).ToList();
+
+            var todayStart = DateTime.SpecifyKind(beijingNow.Date, DateTimeKind.Utc);
             var dueMeds = new List<object>();
             foreach (var m in due)
             {
                 var logged = await db.MedicationLogs.AnyAsync(l =>
-                    l.MedicationId == m.Id && l.CreatedAt >= today.ToDateTime(TimeOnly.MinValue) && l.Status == MedicationLogStatus.Taken, ct);
+                    l.MedicationId == m.Id
+                    && l.CreatedAt >= todayStart
+                    && l.Status == MedicationLogStatus.Taken, ct);
                 if (!logged)
                     dueMeds.Add(new { m.Id, m.Name, m.Dosage, m.TimeOfDay });
             }
@@ -127,6 +136,9 @@ public static class MedicationEndpoints
         });
     }
 
+    private static bool InTimeWindow(TimeOnly t, TimeOnly start, TimeOnly end) =>
+        end > start ? (t >= start && t <= end) : (t >= start || t <= end); // 处理跨午夜
+
     private static Guid GetUserId(HttpContext http) =>
         Guid.TryParse(http.User.FindFirst(System.Security.Claims.ClaimTypes.NameIdentifier)?.Value, out var id) ? id : Guid.Empty;
 }