Add /api/client/servers/{server}/files/chmod endpoint

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

@@ -0,0 +1,31 @@
+<?php
+
+namespace Pterodactyl\Http\Requests\Api\Client\Servers\Files;
+
+use Pterodactyl\Models\Permission;
+use Pterodactyl\Contracts\Http\ClientPermissionsRequest;
+use Pterodactyl\Http\Requests\Api\Client\ClientApiRequest;
+
+class ChmodFilesRequest extends ClientApiRequest implements ClientPermissionsRequest
+{
+    /**
+     * @return string
+     */
+    public function permission(): string
+    {
+        return Permission::ACTION_FILE_UPDATE;
+    }
+
+    /**
+     * @return array
+     */
+    public function rules(): array
+    {
+        return [
+            'root' => 'required|nullable|string',
+            'files' => 'required|array',
+            'files.file' => 'string',
+            'files.mode' => 'integer',
+        ];
+    }
+}