feat: add core entities, controllers, services, and mappers across multi-module project

admin/src/main/java/cn/unizk/mapper/SysFileMapper.java

@@ -0,0 +1,6 @@
+package cn.unizk.mapper;
+
+import cn.unizk.entity.po.SysFile;
+
+public interface SysFileMapper extends UniBaseMapper<SysFile> {
+}