feat(source): 添加过滤已存在关联关系功能

- 在SourceMapper中新增filterExistingRelations方法
- 修改FaceServiceImpl中的关联关系保存逻辑
- 修改TaskFaceServiceImpl中的关联关系保存逻辑
- 修改VideoPieceGetter中的关联关系检查逻辑
- 在SourceMapper.xml中添加filterExistingRelations的SQL实现

src/main/java/com/ycwl/basic/service/task/impl/TaskFaceServiceImpl.java

@@ -153,7 +153,11 @@ public class TaskFaceServiceImpl implements TaskFaceService {
                             memberSourceEntity.setIsBuy(0);
                         }
                     }
-                    sourceMapper.addRelations(memberSourceEntityList);
+                    // 过滤已存在的关联关系，避免重复添加
+                    List<MemberSourceEntity> filteredList = sourceMapper.filterExistingRelations(memberSourceEntityList);
+                    if (!filteredList.isEmpty()) {
+                        sourceMapper.addRelations(filteredList);
+                    }
                     memberRelationRepository.clearSCacheByFace(faceId);
                     VideoPieceGetter.Task task = new VideoPieceGetter.Task();
                     task.faceId = faceEntity.getId();