fix: resolve admin API URL from current origin

Author: itsshashanksp

admin/api.php

@@ -1,7 +1,5 @@
 <?php
 
-putenv('GENERIC_ADMIN_ENABLED=1');
-
 define('API_REQUEST_STARTED', microtime(true));
 define('API_REQUEST_ID', bin2hex(random_bytes(8)));
 ob_start();

admin/assets/admin.js

@@ -1,7 +1,7 @@
 (() => {
   "use strict";
   const adminBase = (document.body.dataset.adminBase || "").replace(/\/+$/, ""),
-    apiUrl = `${adminBase}/api.php`,
+    apiUrl = `${window.location.origin}${adminBase}/api.php`,
     content = document.querySelector("#content"),
     title = document.querySelector("#page-title");
   const navigation = document.querySelector("#navigation"),