```

feat(split-order): 添加微信交易单号搜索功能

- 在订单模型中添加Db类引入以支持数据库查询
- 在搜索字段中添加wx_transaction_id支持
- 实现通过微信交易单号查找订单ID的功能，包括在payment_json和pay_ext表中的查询
- 添加微信交易单号输入框到前端界面
- 更新JavaScript过滤器配置以包含新的搜索字段
```

application/admin/controller/shopro/split/Order.php

@@ -9,6 +9,7 @@ use addons\shopro\library\split\SplitExecutor;
 use addons\shopro\library\split\ProfitSharingService;
 use app\admin\model\shopro\order\Order as ShopOrder;
 use app\admin\model\shopro\user\User as ShopUser;
+use think\Db;
 
 class Order extends Base
 {
@@ -32,7 +33,7 @@ class Order extends Base
     {
         $this->request->filter(['strip_tags']);
         if ($this->request->isAjax()) {
-            $nobuildfields = ['buyer_keyword', 'order_sn', 'status', 'channel', 'createtime'];
+            $nobuildfields = ['buyer_keyword', 'order_sn', 'wx_transaction_id', 'status', 'channel', 'createtime'];
             list($where, $sort, $order, $offset, $limit) = $this->custombuildparams(null, $nobuildfields);
 
             $query = $this->buildSearch();
@@ -71,6 +72,17 @@ class Order extends Base
             $orderIds = ShopOrder::where('order_sn', 'like', '%' . trim($filter['order_sn']) . '%')->column('id');
             $query = $query->where('order_id', 'in', $orderIds ?: [0]);
         }
+        if (!empty($filter['wx_transaction_id'])) {
+            $orderIds = $this->resolveOrderIdsByWxTransactionId($filter['wx_transaction_id']);
+            $query = $query->where(function ($q) use ($orderIds, $filter) {
+                $txn = trim($filter['wx_transaction_id']);
+                $like = '%' . $txn . '%';
+                $q->where('transaction_id', 'like', $like);
+                if ($orderIds) {
+                    $q->whereOr('order_id', 'in', $orderIds);
+                }
+            });
+        }
         if (!empty($filter['buyer_keyword'])) {
             $kw = trim($filter['buyer_keyword']);
             $userIds = ShopUser::where('nickname|mobile', 'like', '%' . $kw . '%')->column('id');
@@ -99,6 +111,26 @@ class Order extends Base
         return $query;
     }
 
+    /**
+     * 微信交易单号 → 商城 order_id（汇付单号在 payment_json / pay_ext.extra）
+     */
+    protected function resolveOrderIdsByWxTransactionId($txn)
+    {
+        $txn = trim((string) $txn);
+        if ($txn === '') {
+            return [];
+        }
+        $like = '%' . $txn . '%';
+        $ids = ShopOrder::where('transaction_id', 'like', $like)->column('id');
+        $ids = array_merge($ids, ShopOrder::where('payment_json', 'like', $like)->column('id'));
+        try {
+            $ids = array_merge($ids, Db::name('shopro_huifu_pay_ext')->where('extra', 'like', $like)->column('order_id'));
+        } catch (\Exception $e) {
+            // table may not exist
+        }
+        return array_values(array_unique(array_filter(array_map('intval', $ids))));
+    }
+
     protected function formatSplitOrderList($list)
     {
         $rows = [];