fix: 仅保留 Waffo，并修复调试包年误用永久 Product

调试不再把兼容字段 product_id 覆盖到包年；包年禁止回落永久商品；下单强制走 Waffo。

backend/internal/service/order/order_service.go

@@ -115,11 +115,14 @@ func (s *OrderService) CreateOrder(req dto.CreateOrderRequest, clientIP, userAge
 		return nil, fmt.Errorf("重复购买拦截: %s", checkResult.Reason)
 	}
 
-	// 4. 选取可用支付渠道（先选网关，写入订单） // Logan.Li
+	// 4. 仅对接 Waffo（禁用其它网关） // Logan.Li
 	var gateway model.PaymentGatewayConfig
-	if err := s.db.Where("enabled = ?", true).Order("priority ASC").First(&gateway).Error; err != nil {
-		return nil, errors.New("暂无可用的支付渠道")
+	if err := s.db.Where("gateway = ? AND enabled = ?", "waffo", true).First(&gateway).Error; err != nil {
+		return nil, errors.New("Waffo 支付未启用，请先在「支付」页配置")
 	}
+	_ = s.db.Model(&model.PaymentGatewayConfig{}).
+		Where("gateway <> ? AND enabled = ?", "waffo", true).
+		Updates(map[string]interface{}{"enabled": false, "priority": 100}).Error
 
 	notes := ""
 	if deviceID := strings.TrimSpace(req.DeviceID); deviceID != "" {
@@ -135,7 +138,7 @@ func (s *OrderService) CreateOrder(req dto.CreateOrderRequest, clientIP, userAge
 		Amount:         plan.Price,
 		Currency:       plan.Currency,
 		Status:         "pending",
-		PaymentGateway: gateway.Gateway,
+		PaymentGateway: "waffo",
 		ClientIP:       clientIP,
 		UserAgent:      userAgent,
 		Notes:          notes,
@@ -145,23 +148,17 @@ func (s *OrderService) CreateOrder(req dto.CreateOrderRequest, clientIP, userAge
 	}
 	_ = customersvc.AttachProduct(s.db, customer.ID, product.ID)
 
-	// 6. 生成收银台地址 // Logan.Li
-	var checkoutURL string
-	if gateway.Gateway == "waffo" {
-		url, err := payment.BuildCheckoutURL(
-			payment.LoadWaffoConfig(s.db),
-			order.OrderNo,
-			strings.TrimSpace(req.DeviceID),
-			req.CustomerEmail,
-			req.ReturnURL,
-			plan.PlanType,
-		)
-		if err != nil {
-			return nil, fmt.Errorf("Waffo 收银台配置错误: %v", err)
-		}
-		checkoutURL = url
-	} else {
-		checkoutURL = fmt.Sprintf("https://checkout.%s.com/?order_no=%s", gateway.Gateway, order.OrderNo)
+	// 6. 生成 Waffo 收银台地址 // Logan.Li
+	checkoutURL, err := payment.BuildCheckoutURL(
+		payment.LoadWaffoConfig(s.db),
+		order.OrderNo,
+		strings.TrimSpace(req.DeviceID),
+		req.CustomerEmail,
+		req.ReturnURL,
+		plan.PlanType,
+	)
+	if err != nil {
+		return nil, fmt.Errorf("Waffo 收银台配置错误: %v", err)
 	}
 
 	return &dto.CreateOrderResponse{
@@ -170,7 +167,7 @@ func (s *OrderService) CreateOrder(req dto.CreateOrderRequest, clientIP, userAge
 		Amount:      plan.Price,
 		Currency:    plan.Currency,
 		Status:      "pending",
-		Gateway:     gateway.Gateway,
+		Gateway:     "waffo",
 		ExpiresAt:   time.Now().Add(30 * time.Minute).Format("2006-01-02 15:04:05"),
 	}, nil
 }

backend/internal/service/payment/waffo.go

@@ -435,10 +435,16 @@ func productIDForPlan(cfg WaffoConfig, planType string) string {
 		if cfg.ProductIDYearly != "" {
 			return cfg.ProductIDYearly
 		}
+		// 禁止回落到永久 Product，避免测包年误用永久价/币种 // Logan.Li
+		return ""
 	case "perpetual", "lifetime":
 		if cfg.ProductIDPerpetual != "" {
 			return cfg.ProductIDPerpetual
 		}
+		if cfg.ProductID != "" {
+			return cfg.ProductID
+		}
+		return ""
 	}
 	if id := strings.TrimSpace(cfg.ProductIDs["default"]); id != "" {
 		return id
@@ -446,10 +452,7 @@ func productIDForPlan(cfg WaffoConfig, planType string) string {
 	if cfg.ProductID != "" {
 		return cfg.ProductID
 	}
-	if cfg.ProductIDPerpetual != "" {
-		return cfg.ProductIDPerpetual
-	}
-	return cfg.ProductIDYearly
+	return firstNonEmpty(cfg.ProductIDPerpetual, cfg.ProductIDYearly)
 }
 
 func currencyForPlan(cfg WaffoConfig, planType string) string {

backend/internal/service/setting/setting_service.go

@@ -256,8 +256,8 @@ func (s *SettingService) UpdateWaffo(req dto.WaffoSettingsUpdate) (*dto.WaffoSet
 		return nil, errors.New("保存 Waffo 配置失败")
 	}
 	_ = s.db.Model(&model.PaymentGatewayConfig{}).
-		Where("gateway <> ? AND enabled = ?", "waffo", true).
-		Update("priority", 100).Error
+		Where("gateway <> ?", "waffo").
+		Updates(map[string]interface{}{"enabled": false, "priority": 100}).Error
 
 	return s.GetWaffo()
 }
@@ -281,9 +281,10 @@ func (s *SettingService) DebugWaffo(req dto.WaffoDebugRequest) *dto.WaffoDebugRe
 	if planType == "" {
 		planType = "yearly"
 	}
-	productID := strings.TrimSpace(req.ProductID)
+	// 按计划解析 Product；忽略兼容字段 product_id（常为永久商品，会污染包年调试） // Logan.Li
+	productID := payment.ResolveProductID(cfg, planType)
 	if productID == "" {
-		productID = payment.ResolveProductID(cfg, planType)
+		productID = strings.TrimSpace(req.ProductID)
 	}
 
 	authMode := "none"