feat(pay-v2): P8 Task6 拒付 chargeback 记录 + chargeback.received

internal/store/order_query.go

@@ -26,6 +26,19 @@ func (s *OrderStore) GetOrder(outTradeNo string) (*model.OrderV2, error) {
 	return &o, nil
 }
 
+// MarkDisputed 打拒付标(P8 Task6):条件 UPDATE 仅在 disputed=false 时翻转,幂等——
+// 重投同一 dispute 命中 rows_affected=0,不报错,调用方(recordChargeback)不看返回值
+// 也安全(打标不改状态机,不存在"取消标记"这一操作,单向翻转足够)。
+func (s *OrderStore) MarkDisputed(outTradeNo string) (bool, error) {
+	res := s.db.Model(&model.OrderV2{}).
+		Where("out_trade_no = ? AND disputed = ?", outTradeNo, false).
+		Update("disputed", true)
+	if res.Error != nil {
+		return false, fmt.Errorf("store.MarkDisputed: %w", res.Error)
+	}
+	return res.RowsAffected > 0, nil
+}
+
 // AttemptByProviderRef resolves an attempt from a bare provider_ref, so settlement
 // can recover out_trade_no + channel from a callback/query that only carries the ref.
 func (s *OrderStore) AttemptByProviderRef(providerRef string) (*model.Attempt, error) {