fix(workbench): 修复今日/昨日/最近七天订单金额未扣除退款金额的问题

- 在计算订单总金额时，增加了对退款金额的处理
- 使用 bcsub 函数精确计算支付金额和退款金额的差值
- 优化了数据计算逻辑，提高了报表数据的准确性

app/store/logic/WorkbenchLogic.php

@@ -70,7 +70,9 @@ class WorkbenchLogic extends BaseLogic
         }
         $orderLogic = new StoreOrderLogic();
         //订单总金额
-        $data['order_amount'] = $orderLogic->storeOrderSumByDate($startTime, $endTime, $where);
+        $pay_price=$orderLogic->storeOrderSumByDate($startTime, $endTime, $where);
+        $refund_price=$orderLogic->storeOrderSumByDate($startTime, $endTime, $where,'refund_price');
+        $data['order_amount'] = bcsub($pay_price,$refund_price);
         //余额支付总金额
         $data['balance_amount'] = $orderLogic->storeOrderSumByDate($startTime, $endTime, array_merge($where, ['pay_type' => PayEnum::BALANCE_PAY]));
         //微信条码支付总金额