修复店铺名不存在的问题

internal/model/refund.go

@@ -18,6 +18,7 @@ type RefundRequest struct {
 	OrderID        uint   `gorm:"column:order_id;index;not null;comment:关联订单ID" json:"order_id"`
 	PackageUsageID *uint  `gorm:"column:package_usage_id;comment:关联套餐使用记录ID（可选）" json:"package_usage_id,omitempty"`
 	ShopID         *uint  `gorm:"column:shop_id;index;comment:店铺ID（从订单获取，用于数据权限过滤）" json:"shop_id,omitempty"`
+	ShopName       string `gorm:"column:shop_name;->" json:"shop_name,omitempty"`
 
 	// 金额信息
 	ActualReceivedAmount  int64  `gorm:"column:actual_received_amount;type:bigint;not null;comment:实收金额（分）" json:"actual_received_amount"`