refactor(shop): 优化关联查询方式

- 将 ShopDealerRefereeMapper.xml 中的 LEFT JOIN 改为 INNER JOIN
- 提高查询效率，仅返回有匹配记录的结果

src/main/java/com/gxwebsoft/shop/mapper/xml/ShopDealerRefereeMapper.xml

@@ -12,8 +12,8 @@
                u.avatar,
                u.phone
         FROM shop_dealer_referee a
-        LEFT JOIN gxwebsoft_core.sys_user d ON a.dealer_id = d.user_id AND d.deleted = 0
-        LEFT JOIN gxwebsoft_core.sys_user u ON a.user_id = u.user_id AND u.deleted = 0
+        INNER JOIN gxwebsoft_core.sys_user d ON a.dealer_id = d.user_id AND d.deleted = 0
+        INNER JOIN gxwebsoft_core.sys_user u ON a.user_id = u.user_id AND u.deleted = 0
         <where>
             <if test="param.id != null">
                 AND a.id = #{param.id}