fix(wuliu): 修复数据库迁移文件中的列类型定义

- 将 Column::STRING 常量替换为字符串 'string' 类型定义
- 修正 addTimestamps 方法调用，明确指定时间戳字段名称

database/migrations/20250727172015_wuliu.php

@@ -87,7 +87,7 @@ class Wuliu extends AbstractMigration
             ->addColumn('courier_phone', 'string', ['limit' => 32, 'default' => '', 'comment' => '快递员电话'])
             ->addColumn('take_time', 'string', ['limit' => 32, 'default' => '', 'comment' => '发货到收货消耗时长'])
             ->addColumn('logo', 'string', ['limit' => 255, 'default' => '', 'comment' => '快递公司LOGO'])
-            ->addTimestamps()
+            ->addTimestamps('create_time', 'update_time')
             ->addIndex('number')
             ->create();
     }

database/migrations/20250913071830_extension_wuliu_express.php

@@ -28,8 +28,8 @@ class ExtensionWuliuExpress extends AbstractMigration
     public function change()
     {
         $table = $this->table('extension_wuliu_express');
-        $table->addColumn('name', Column::STRING, ['limit' => 255, 'comment' => '快递公司名称'])
-            ->addColumn('code', Column::STRING, ['limit' => 255, 'comment' => '快递公司编码'])
+        $table->addColumn('name', 'string', ['limit' => 255, 'comment' => '快递公司名称'])
+            ->addColumn('code', 'string', ['limit' => 255, 'comment' => '快递公司编码'])
             ->addIndex('code', ['unique' => true])
             ->create();
     }