feat(v2): gateway.Refund 编排(部分/多次累计 + 超退守卫 + crypto 人工向闭环)+ RefundingProvider 加 refundID 幂等键

internal/gateway/settle_test.go

@@ -137,6 +137,7 @@ func TestSettleEnqueueFailureKeepsOrderPending(t *testing.T) {
 func TestSettleTransientReadErrorIsFailed(t *testing.T) {
 	db := model.OpenTestDB(t)
 	orders := store.NewOrderStore(db)
+	refunds := store.NewRefundStore(db)
 	preg := provider.NewRegistry()
 	fp := fake.New()
 	preg.Register(fp)
@@ -145,7 +146,7 @@ func TestSettleTransientReadErrorIsFailed(t *testing.T) {
 	})
 	picker := accounts.NewRouter(areg, nil, nil)
 	spy := &spyEnqueuer{}
-	g := gateway.New(orders, preg, picker, stubResolver{}, spy, "global")
+	g := gateway.New(orders, refunds, preg, picker, stubResolver{}, spy, "global")
 
 	ctx := context.Background()
 	g.CreateOrder(ctx, gateway.CreateOrderInput{SKU: "pro_year", Method: "fake", BizSystem: "pangolin", BizRef: "u-1"})