新增：新增功能权限适配及校验

1.后端 API 注解鉴权使用方式：@SaCheckPermission("system:user:add")
2.前端全局指令函数使用方式：v-permission="['system:user:add']"
3.前端权限判断函数使用方式：checkPermission(['system:user:add'])

continew-admin-system/src/main/resources/mapper/MenuMapper.xml

@@ -1,4 +1,16 @@
 <?xml version="1.0" encoding="UTF-8" ?>
 <!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd" >
 <mapper namespace="top.charles7c.cnadmin.system.mapper.MenuMapper">
+    <select id="selectPermissionsByUserId" resultType="java.lang.String">
+        SELECT DISTINCT m.`permission`
+        FROM `sys_menu` m
+                 LEFT JOIN `sys_role_menu` rm ON rm.`menu_id` = m.`menu_id`
+                 LEFT JOIN `sys_role` r ON r.`role_id` = rm.`role_id`
+                 LEFT JOIN `sys_user_role` ur ON ur.`role_id` = rm.`role_id`
+                 LEFT JOIN `sys_user` u ON u.`user_id` = ur.`user_id`
+        WHERE u.`user_id` = #{userId}
+          AND m.`menu_type` IN (2, 3)
+          AND m.`status` = 1
+          AND r.`status` = 1
+    </select>
 </mapper>