参数记录去重

YD_Event.Application/Event/EventRecordService.cs

@@ -119,8 +119,8 @@ public class EventRecordService : BaseService<EventRegistration>, ITransient
             .Select(g => {
                 // 获取该赛事最早的报名记录作为主记录
                 var firstRecord = g.OrderBy(x => x.CreatedTime).First();
-                // 收集该赛事的所有报名记录ID
-                var registrationIds = g.Select(x => x.RegistrationId).ToList();
+                // 收集该赛事的所有报名记录ID（去重）
+                var registrationIds = g.Select(x => x.RegistrationId).Distinct().ToList();
                 
                 return new EventRecordOutput
                 {