fix(order): 修复子订单统计查询条件

- 添加 is_split_child = '1' 条件以正确过滤子订单记录
- 确保订单状态统计只包含有效的主订单数据

ruoyi-modules/ruoyi-order/src/main/resources/mapper/order/OrderMainMapper.xml

@@ -42,6 +42,7 @@
                SUM(CASE WHEN order_status = '4' THEN 1 ELSE 0 END) AS pendingReceiptCount
         FROM order_main
         WHERE customer_id = #{customerId}
+          AND is_split_child = '1'
           AND del_flag = '0'
     </select>
 </mapper>