refactor: 目录结构调整和代码优化

src/main/java/com/youlai/boot/system/mapper/RoleMapper.java

@@ -0,0 +1,20 @@
+package com.youlai.boot.system.mapper;
+
+import com.baomidou.mybatisplus.core.mapper.BaseMapper;
+import com.youlai.boot.system.model.entity.Role;
+import org.apache.ibatis.annotations.Mapper;
+
+import java.util.Set;
+
+@Mapper
+public interface RoleMapper extends BaseMapper<Role> {
+
+
+    /**
+     * 获取最大范围的数据权限
+     *
+     * @param roles
+     * @return
+     */
+    Integer getMaximumDataScope(Set<String> roles);
+}