feat: update order model with packaging_fee and international_fee, remove tax

backend/internal/api/handlers/order.go

@@ -378,22 +378,25 @@ func (h *OrderHandler) Create(c *gin.Context) {
 	}
 
 	// 获取其他费率
-	var serviceFeeRate, taxRate, channelFeeRate float64
+	var serviceFeeRate, channelFeeRate, packagingFee, internationalFeeRate float64
 	var setting models.SystemSetting
 	if err := utils.DB.Where("`key` = ?", "service_fee_rate").First(&setting).Error; err == nil {
 		serviceFeeRate, _ = strconv.ParseFloat(setting.Value, 64)
 	}
-	if err := utils.DB.Where("`key` = ?", "tax_rate").First(&setting).Error; err == nil {
-		taxRate, _ = strconv.ParseFloat(setting.Value, 64)
-	}
 	if err := utils.DB.Where("`key` = ?", "payment_channel_fee_rate").First(&setting).Error; err == nil {
 		channelFeeRate, _ = strconv.ParseFloat(setting.Value, 64)
 	}
+	if err := utils.DB.Where("`key` = ?", "packaging_fee").First(&setting).Error; err == nil {
+		packagingFee, _ = strconv.ParseFloat(setting.Value, 64)
+	}
+	if err := utils.DB.Where("`key` = ?", "international_fee_rate").First(&setting).Error; err == nil {
+		internationalFeeRate, _ = strconv.ParseFloat(setting.Value, 64)
+	}
 
 	serviceFee := subtotal * serviceFeeRate / 100
-	tax := subtotal * taxRate / 100
 	channelFee := subtotal * channelFeeRate / 100
-	totalAmount := subtotal + shippingFee + serviceFee + tax + channelFee
+	internationalFee := subtotal * internationalFeeRate / 100
+	totalAmount := subtotal + shippingFee + serviceFee + channelFee + packagingFee + internationalFee
 
 	order := models.Order{
 		UserID:            userID,
@@ -401,8 +404,9 @@ func (h *OrderHandler) Create(c *gin.Context) {
 		Subtotal:          subtotal,
 		ShippingFee:       shippingFee,
 		ServiceFee:        serviceFee,
-		Tax:               tax,
 		ChannelFee:        channelFee,
+		PackagingFee:      packagingFee,
+		InternationalFee:  internationalFee,
 		TotalAmount:       totalAmount,
 		Status:            models.OrderStatusPendingPayment,
 		ShippingAddressID: &req.ShippingAddressID,