feat(apk): 添加文件名返回字段

- 在响应数据中增加 filename 字段
- 返回附件的原始文件名信息

application/api/controller/Apk.php

@@ -103,6 +103,7 @@ class Apk extends Api
         }
         $response = [
             'url' => $this->request->domain() . $attachment->url,
+            'filename' => $attachment->filename,
         ];
 
         $this->success('获取成功', $response);