feat: 为折扣计算函数 getDiscount 引入新用户判断逻辑以支持新用户专属折扣。

internal/logic/public/order/preCreateOrderLogic.go

@@ -133,10 +133,11 @@ func (l *PreCreateOrderLogic) PreCreateOrder(req *types.PurchaseOrderRequest) (r
 	}
 
 	var discount float64 = 1
+	isNewUserForDiscount := time.Since(u.CreatedAt) <= 24*time.Hour
 	if sub.Discount != "" {
 		var dis []types.SubscribeDiscount
 		_ = json.Unmarshal([]byte(sub.Discount), &dis)
-		discount = getDiscount(dis, req.Quantity)
+		discount = getDiscount(dis, req.Quantity, isNewUserForDiscount)
 	}
 	price := sub.UnitPrice * req.Quantity