Switch file manager listing to use panel API endpoint

app/Http/Requests/Api/Client/Servers/Files/ListFilesRequest.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace Pterodactyl\Http\Requests\Api\Client\Servers\Files;
+
+use Pterodactyl\Models\Server;
+use Pterodactyl\Http\Requests\Api\Client\ClientApiRequest;
+
+class ListFilesRequest extends ClientApiRequest
+{
+    /**
+     * Check that the user making this request to the API is authorized to list all
+     * of the files that exist for a given server.
+     *
+     * @return bool
+     */
+    public function authorize(): bool
+    {
+        return $this->user()->can('list-files', $this->getModel(Server::class));
+    }
+}