确认收款失败后跳过该商户，再点收款可换号。

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

yonghu/tixian_shenhe_views.py

@@ -414,6 +414,12 @@ def process_audit_collect(request):
                     [c.get('MCHID') for c in prefer_cfgs],
                 )
                 mch_cfgs = prefer_cfgs
+            elif failed_mchs and not prefer_cfgs:
+                # 可用商户都失败过：仍按原序再试一轮（例如限额日切后可能恢复）
+                logger.warning(
+                    '可用商户均曾失败，按原序再试 shenhe=%s failed=%s',
+                    shenhe_danhao, sorted(failed_mchs),
+                )
             _log_wx_collect(
                 '开始轮换',
                 shenhe=shenhe_danhao,