增加code唯一校验，修改导入返回值

lyh

2025-07-09 e70c3d7a34ad9e9023abd9fc669bdf4e4a082a38

 lxzn-module-system/lxzn-system-biz/src/main/java/org/jeecg/modules/system/mapper/SysPositionMapper.java

@@ -11,4 +11,6 @@
 */
public interface SysPositionMapper extends BaseMapper<SysPosition> {

    String findLastCode();

}