feat: 商家退款申请支持证据图片

新增 tuikuantupian 表；申请退款必传图片；打手详情与客服订单详情返回退款图。

Co-authored-by: Cursor <cursoragent@cursor.com>

users/views/kefu_orders.py

@@ -1641,13 +1641,24 @@ class KefuGetOrderDetailView(APIView):
             logger.exception(f"[kefuhqddxq] 打手图片查询异常 dingdan_id={dingdan_id}")
             response_data['dashou_images'] = []
 
-        # 7. 退款理由
+        # 7. 退款理由 + 证据图
         try:
             tuikuan_record = RefundRecord.query.filter(OrderID=dingdan_id).order_by('-CreateTime').first()
             response_data['tuikuan_liyou'] = tuikuan_record.Reason if tuikuan_record and tuikuan_record.Reason else ''
         except Exception as e:
             logger.exception(f"[kefuhqddxq] 退款理由查询异常 dingdan_id={dingdan_id}")
             response_data['tuikuan_liyou'] = ''
+        try:
+            from orders.models import RefundEvidenceImage
+            response_data['tuikuan_tupian'] = list(
+                RefundEvidenceImage.query.filter(OrderID=dingdan_id)
+                .exclude(ImageURL__isnull=True)
+                .exclude(ImageURL='')
+                .values_list('ImageURL', flat=True)
+            )
+        except Exception as e:
+            logger.exception(f"[kefuhqddxq] 退款图片查询异常 dingdan_id={dingdan_id}")
+            response_data['tuikuan_tupian'] = []
 
         # 8. 指定打手响应
         ZHIDING_HF_TEXT = {1: '想接', 2: '不想接', 3: '等会接'}