管理后台剩余可退款金额变量名优化；

application/admin/controller/shopro/order/Aftersale.php

@@ -245,10 +245,10 @@ class Aftersale extends Common
         // 使用与 OrderRefund 相同的逻辑计算剩余可退款金额（不包含积分）
         $payOper = new PayOper($order->user_id);
         $pays = $payOper->getCanRefundPays($order->id);
-        $remain_max_refund_money = $payOper->getRemainRefundMoney($pays);
+        $refund_surplus_money = $payOper->getRemainRefundMoney($pays);
 
         // 如果退款金额大于剩余可退款金额
-        if (bccomp((string)$refund_money, $remain_max_refund_money, 2) === 1) {
+        if (bccomp((string)$refund_money, $refund_surplus_money, 2) === 1) {
             $this->error('退款总金额不能大于实际支付金额');
         }
 
@@ -261,7 +261,7 @@ class Aftersale extends Common
             $this->error('订单商品已退款，不能重复退款');
         }
 
-        $aftersale = Db::transaction(function () use ($aftersale, $order, $orderItem, $refund_money, $refund_type, $refund_surplus_money, $admin) {
+        $aftersale = Db::transaction(function () use ($aftersale, $order, $orderItem, $refund_money, $refund_type, $admin) {
             $aftersale->aftersale_status = OrderAftersaleModel::AFTERSALE_STATUS_COMPLETED;    // 售后同意
             $aftersale->refund_status = OrderAftersaleModel::REFUND_STATUS_AGREE;    // 同意退款
             $aftersale->refund_fee = $refund_money;     // 退款金额