Refactor API structure: update internal handling, enhance input retrieval, and improve template loading

api/auth/isauth.php

@@ -2,11 +2,12 @@
 // Set internal to false so that the answer goes to the client
 if (!isset($internal)) {
     $internal = false;
+    define("API_DIR", "../");
 }
 
 // Load Main Library
-require "../api.php";
-$api = new gbAPI(true);
+require API_DIR . "api.php";
+$api = new gbAPI(true, $internal);
 
 $api->answer(200, [
     "login" => true,