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/gateway_test.go

@@ -49,7 +49,9 @@ func (s *spyEnqueuer) Enqueue(outTradeNo, bizSystem, eventType, refundID string,
 
 func newGateway(t *testing.T) (*gateway.Gateway, *fake.Provider, *spyEnqueuer, *store.OrderStore) {
 	t.Helper()
-	orders := store.NewOrderStore(model.OpenTestDB(t))
+	db := model.OpenTestDB(t)
+	orders := store.NewOrderStore(db)
+	refunds := store.NewRefundStore(db)
 	preg := provider.NewRegistry()
 	fp := fake.New()
 	preg.Register(fp)
@@ -60,7 +62,7 @@ func newGateway(t *testing.T) (*gateway.Gateway, *fake.Provider, *spyEnqueuer, *
 	})
 	picker := accounts.NewRouter(areg, nil, nil) // 默认 round_robin
 	spy := &spyEnqueuer{}
-	g := gateway.New(orders, preg, picker, stubResolver{}, spy, "global")
+	g := gateway.New(orders, refunds, preg, picker, stubResolver{}, spy, "global")
 	return g, fp, spy, orders
 }