feat(index): create a dedicated route for api

to prevent sending cookies on all routes

index.php

@@ -0,0 +1,24 @@
+<?php
+
+/**
+ * SPDX-License-Identifier: EUPL-1.2
+ * Authors: see /README.md
+ */
+
+use SeaCMS\Api\JsonResponse;
+
+$end = 'vendor/picocms/plugins/SeacmsApi/index.php';
+if (empty($_SERVER['SCRIPT_NAME']) || 
+    empty($_SERVER['SCRIPT_FILENAME']) || 
+    substr($_SERVER['SCRIPT_NAME'],-strlen($end)) != $end){
+
+    if (!class_exists(JsonResponse::class,false)){
+        include_once __DIR__.'/src/JsonResponse.php';
+    }
+
+    echo (new JsonResponse(500,['code'=>500,'reason'=>'bad url to run this file']))->send();
+} else {
+    chdir(dirname($_SERVER['SCRIPT_FILENAME'],5));
+    $GLOBALS['PicoVendorsDirectoryRelativeLevels'] = 4;
+    include 'index.php';
+}