feat(v2): outbox 退款感知(refund_id 进唯一键)+ 投递门禁放行退款态 + Enqueue 贯通 refundID

internal/webhook/notifier.go

@@ -43,13 +43,14 @@ func NewNotifier(ws *store.WebhookStore, bizConfig BizConfigFunc, orderPaid Orde
 }
 
 // Enqueue implements gateway.WebhookEnqueuer: serialize the domain payload and
-// idempotently persist it to the outbox (delivery happens async).
-func (n *Notifier) Enqueue(outTradeNo, bizSystem, eventType string, data map[string]any) error {
+// idempotently persist it to the outbox (delivery happens async). refundID is
+// the refund's idempotency dimension (payment events pass "").
+func (n *Notifier) Enqueue(outTradeNo, bizSystem, eventType, refundID string, data map[string]any) error {
 	body, err := json.Marshal(data)
 	if err != nil {
 		return fmt.Errorf("webhook.Enqueue marshal: %w", err)
 	}
-	return n.deliveries.EnqueueDelivery(outTradeNo, bizSystem, eventType, string(body))
+	return n.deliveries.EnqueueDelivery(outTradeNo, bizSystem, eventType, refundID, string(body))
 }
 
 // DeliverPending flushes undelivered rows; returns how many succeeded this pass.