feat(v2): gateway 经 Picker 路由选账户 + retry 换号(ExcludeAccounts);替换首个 enabled

internal/gateway/gateway_test.go

@@ -48,9 +48,11 @@ func newGateway(t *testing.T) (*gateway.Gateway, *fake.Provider, *spyEnqueuer, *
 	// fake 注册在 method "fake";账户按 channel="fake" region="global" 配。
 	areg := accounts.New([]config.AccountConfig{
 		{AccountID: "fake-a1", Channel: "fake", Region: "global", Enabled: true, Weight: 1},
+		{AccountID: "fake-a2", Channel: "fake", Region: "global", Enabled: true, Weight: 1},
 	})
+	picker := accounts.NewRouter(areg, nil, nil) // 默认 round_robin
 	spy := &spyEnqueuer{}
-	g := gateway.New(orders, preg, areg, stubResolver{}, spy, "global")
+	g := gateway.New(orders, preg, picker, stubResolver{}, spy, "global")
 	return g, fp, spy, orders
 }
 
@@ -118,3 +120,18 @@ func TestRetryAndCancel(t *testing.T) {
 		t.Fatalf("canceled 单 retry 应 ErrOrderNotPending, got %v", err)
 	}
 }
+
+func TestRetrySwitchesAccount(t *testing.T) {
+	g, _, _, orders := newGateway(t)
+	ctx := context.Background()
+	res, _ := g.CreateOrder(ctx, gateway.CreateOrderInput{SKU: "pro_year", Method: "fake", BizSystem: "pangolin", BizRef: "u-1"})
+
+	// 首单落 fake-a1(round_robin 计数 0);retry 排除 a1 → 必落 fake-a2。
+	if _, err := g.RetryOrder(ctx, res.OrderNo, "fake"); err != nil {
+		t.Fatalf("retry: %v", err)
+	}
+	pend, _ := orders.ListAttemptsByStatus(model.AttemptPending, 10)
+	if len(pend) != 1 || pend[0].AccountID != "fake-a2" {
+		t.Fatalf("retry 应换到 fake-a2, got %+v", pend)
+	}
+}