reorganize and cleanup php server code

server/app/Http/Requests/User/UploadAvatarRawRequest.php

@@ -0,0 +1,15 @@
+<?php
+
+namespace Vanguard\Http\Requests\User;
+
+use Vanguard\Http\Requests\Request;
+
+class UploadAvatarRawRequest extends Request
+{
+    public function rules()
+    {
+        return [
+            'file' => 'required|image'
+        ];
+    }
+}