fix: 创建订单时设置30分钟支付过期时间

backend/internal/api/handlers/order.go

@@ -176,6 +176,12 @@ func checkOrdersExpired(orders []models.Order) {
 	}
 }
 
+// getPaymentExpiryTime 获取支付过期时间（当前时间 + 30分钟）
+func getPaymentExpiryTime() *time.Time {
+	t := time.Now().Add(30 * time.Minute)
+	return &t
+}
+
 func (h *OrderHandler) List(c *gin.Context) {
 	userID := c.GetUint("user_id")
 	role, _ := c.Get("role")
@@ -401,6 +407,7 @@ func (h *OrderHandler) Create(c *gin.Context) {
 		Status:            models.OrderStatusPendingPayment,
 		ShippingAddressID: &req.ShippingAddressID,
 		PaymentMethod:     req.PaymentMethod,
+		PaymentExpiresAt:  getPaymentExpiryTime(),
 	}
 
 	tx := utils.DB.Begin()