fix: TeamScorePoolService 使用 selectList+findFirst 避免重复数据导致 TooManyResultsException

backend/src/main/java/com/designhub/service/TeamScorePoolService.java

@@ -29,10 +29,13 @@ public class TeamScorePoolService {
      * 使用 dept_id 关联部门（team_id 为遗留字段）。若当前部门无积分池且存在父部门，则向上查找父部门积分池（三级部门共享二级）。
      */
     public TeamScorePool getByDeptId(Long deptId) {
-        TeamScorePool pool = teamScorePoolMapper.selectOne(
+        // 使用 selectList + findFirst 避免重复数据导致的 TooManyResultsException
+        TeamScorePool pool = teamScorePoolMapper.selectList(
             new LambdaQueryWrapper<TeamScorePool>()
                 .eq(TeamScorePool::getDeptId, deptId)
-        );
+                .orderByAsc(TeamScorePool::getId)
+                .last("LIMIT 1")
+        ).stream().findFirst().orElse(null);
 
         if (pool == null) {
             Department department = departmentMapper.selectById(deptId);