fix(mapper): 修复网站查询中的表别名引用问题

- 为app_user表添加别名au以避免字段冲突
- 确保website_id字段正确从别名表中引用
- 保持deleted字段的过滤条件一致性

src/main/java/com/gxwebsoft/cms/mapper/xml/CmsWebsiteMapper.xml

@@ -434,8 +434,8 @@
         AND (
           a.user_id = #{param.memberUserId}
           OR a.website_id IN (
-            SELECT website_id FROM app_user
-            WHERE user_id = #{param.memberUserId} AND deleted = 0
+            SELECT au.website_id FROM app_user au
+            WHERE au.user_id = #{param.memberUserId} AND au.deleted = 0
           )
         )
       </if>