update: fix exporting surge config file without file name

app/Http/Controllers/Client/Protocols/Surge.php

@@ -21,6 +21,9 @@ class Surge
         $servers = $this->servers;
         $user = $this->user;
 
+        $appName = config('v2board.app_name', 'V2Board');
+        header("content-disposition:attachment;filename*=UTF-8''".rawurlencode($appName).".conf");
+
         $proxies = '';
         $proxyGroup = '';