feat(platform-orders): 导出CSV增加最近批量生效字段

tests/Feature/AdminPlatformOrderExportTest.php

@@ -123,6 +123,8 @@ class AdminPlatformOrderExportTest extends TestCase
         $this->assertStringContainsString('PO_EXPORT_0001', $content);
         $this->assertStringContainsString('同步失败原因', $content);
         $this->assertStringContainsString('订阅ID', $content);
+        $this->assertStringContainsString('最近批量生效时间', $content);
+        $this->assertStringContainsString('最近批量生效管理员', $content);
 
         // include_meta=1 时应包含 meta(JSON) 列
         $res2 = $this->get('/admin/platform-orders/export?include_meta=1');