fix(order): 修复商户返佣比例配置插入逻辑

- 添加了对商户返佣比例配置存在性的检查
- 避免重复插入相同的配置数据
- 确保只有在配置不存在时才执行插入操作
- 保持原有返佣比例设置逻辑不变

app/common/repositories/merchant/order/OrderMerchantRepository.php

@@ -1298,11 +1298,14 @@ class OrderMerchantRepository extends BaseRepository
         $mer_fanyongbili = merchantConfig($order['mer_id'], 'base_commission');
         //如果商户返佣比例设置的是0怎查系统设设置的分佣比例
         if ($mer_fanyongbili == 0) {
-            Db::name('system_config_value')->insert([
-                'config_key'  => 'base_commission',
-                'value'       => (int)5,
-                'mer_id'      => $order['mer_id'],
-            ]);
+            $mer_fanyongbiliConfig = Db::name('system_config_value')->where('config_key', 'base_commission')->where('mer_id', $order['mer_id'])->find();
+            if ($mer_fanyongbiliConfig) {
+                Db::name('system_config_value')->insert([
+                    'config_key' => 'base_commission',
+                    'value' => (int)5,
+                    'mer_id' => $order['mer_id'],
+                ]);
+            }
             $mer_fanyongbili = 5;
             // $mer_fanyongbili = merchantConfig(0, 'extension_one_rate');
         }