fix: 报名时检查是否已存在相同选手记录，避免重复创建

- 在提交报名时，先检查是否已存在相同选手+比赛+项目的记录
- 如果存在则更新订单ID，而不是创建新记录
- 解决添加选手后再报名导致重复记录的问题

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>

src/main/java/org/springblade/modules/martial/controller/MartialRegistrationOrderController.java

@@ -167,6 +167,24 @@ public class MartialRegistrationOrderController extends BladeController {
 				
 				// Create a record for each project
 				for (Long projectId : projectIds) {
+					// Check if record already exists for this athlete + competition + project
+					LambdaQueryWrapper<MartialAthlete> checkWrapper = new LambdaQueryWrapper<>();
+					checkWrapper.eq(MartialAthlete::getCompetitionId, dto.getCompetitionId())
+						.eq(MartialAthlete::getProjectId, projectId)
+						.eq(MartialAthlete::getIdCard, existingAthlete.getIdCard())
+						.eq(MartialAthlete::getIsDeleted, 0);
+					MartialAthlete existingRecord = athleteService.getOne(checkWrapper, false);
+					
+					if (existingRecord != null) {
+						// Update existing record with order info
+						existingRecord.setOrderId(orderId);
+						existingRecord.setRegistrationStatus(1);
+						existingRecord.setUpdateUser(AuthUtil.getUserId());
+						existingRecord.setUpdateTime(new java.util.Date());
+						athleteService.updateById(existingRecord);
+						log.info("更新已存在的选手参赛记录: playerName={}, projectId={}", existingAthlete.getPlayerName(), projectId);
+					} else {
+						// Create new record
 						MartialAthlete newRecord = new MartialAthlete();
 						newRecord.setOrderId(orderId);
 						newRecord.setCompetitionId(dto.getCompetitionId());
@@ -191,6 +209,7 @@ public class MartialRegistrationOrderController extends BladeController {
 					}
 				}
 			}
+		}
 		
 		return R.data(order);
 	}