feat: club 表独立 mch_key 字段，后台明确区分 APIv2 收款与 APIv3 提现

- 新增 club.mch_key 列并迁移 config_json 历史数据，api_v3_key 保持独立
- club-manage 读写 mch_key；支付读 club.mch_key 优先，兼容 config_json 回落
- 提现查单返回商户号改读俱乐部 V3 配置；不影响其他业务逻辑

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

users/tixian_shenhe_services.py

@@ -1177,7 +1177,8 @@ def _sync_record_from_wx_query(auto_record, wx_data):
         if auto_record.zhuangtai == 0:
             auto_record.wechat_package = json.dumps(package, ensure_ascii=False)
             auto_record.save(update_fields=['wechat_package', 'UpdateTime'])
-        wx_cfg = settings.WECHAT_PAY_V3_CONFIG
+        from jituan.services.wechat_pay import get_wechat_v3_config, club_id_for_tixian_yonghuid
+        wx_cfg = get_wechat_v3_config(club_id_for_tixian_yonghuid(auto_record.yonghuid))
         return RECONCILE_WAIT_CONFIRM, {
             'tixian_id': auto_record.tixian_id,
             'package_info': package,