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/e2e_crypto_test.go

@@ -44,6 +44,7 @@ func TestE2ECryptoQuerySettles(t *testing.T) {
 
 	db := model.OpenTestDB(t)
 	orders := store.NewOrderStore(db)
+	refunds := store.NewRefundStore(db)
 	acctReg := accounts.New([]config.AccountConfig{
 		{AccountID: "e2e-1", Channel: "crypto", Enabled: true, Region: "global", CredentialEnvPrefix: "e2e"},
 	})
@@ -55,7 +56,7 @@ func TestE2ECryptoQuerySettles(t *testing.T) {
 	picker := accounts.NewRouter(acctReg, nil, nil)
 
 	spy := &spyEnqueuer{}
-	g := gateway.New(orders, preg, picker, cryptoResolver{}, spy, "global")
+	g := gateway.New(orders, refunds, preg, picker, cryptoResolver{}, spy, "global")
 
 	// 下单 → 从 session payload 拿到期望链上金额(base+唯一尾数),喂给假 TronGrid。
 	res, err := g.CreateOrder(context.Background(), gateway.CreateOrderInput{