feat(UserMapper): 修改用户查询条件

- 将用户查询条件从用户名改为 openid
- 此修改使得系统能够根据 openid 获取用户信息，提高了安全性

src/main/resources/mapper/system/UserMapper.xml

@@ -156,7 +156,7 @@
                 LEFT JOIN sys_user_role t2 ON t2.user_id = t1.id
                 LEFT JOIN sys_role t3 ON t3.id = t2.role_id
         WHERE
-            t1.username = #{username} AND t1.is_deleted = 0
+            t1.openid = #{openid} AND t1.is_deleted = 0
     </select>
 
     <!-- 获取用户导出列表 -->