修复购买产品优惠记录创建时的mark字段问题

在创建购买产品优惠记录时，如果未提供mark参数，将从预订单购物车信息中获取相应的mark值。此修复确保了当没有直接提供mark值时，能够从关联的预订单购物车信息中正确地获取该值。

app/admin/logic/purchase_product_offer/PurchaseProductOfferLogic.php

@@ -5,6 +5,7 @@ namespace app\admin\logic\purchase_product_offer;
 
 use app\common\model\purchase_product_offer\PurchaseProductOffer;
 use app\common\logic\BaseLogic;
+use app\common\model\beforehand_order\BeforehandOrder;
 use app\common\model\beforehand_order_cart_info\BeforehandOrderCartInfo;
 use support\exception\BusinessException;
 use think\facade\Db;
@@ -30,13 +31,17 @@ class PurchaseProductOfferLogic extends BaseLogic
     {
         Db::startTrans();
         try {
+            $mark=$params['mark'] ?? '';
+            if($mark==''){
+                $mark=BeforehandOrderCartInfo::where('bhoid',$params['order_id'])->where('product_id',$params['product_id'])->value('mark');
+            }
             PurchaseProductOffer::create([
                 'order_id' => $params['order_id'],
                 'product_id' => $params['product_id'],
                 'unit' => $params['unit'],
                 'is_buyer' => $params['is_buyer'],
                 'need_num' => $params['need_num'],
-                'mark' => $params['mark'] ?? '',
+                'mark' => $mark,
                 'buyer_id' => $params['buyer_id'],
                 'status' => 0,