Enhance API error handling and response structure; update app name retrieval method

public/admin/index.php

@@ -0,0 +1,22 @@
+<?php
+// Set debug to true
+$debug = true;
+
+// Load Main Library
+require "../main.php";
+
+// Init Main Class
+$gb = new gb($debug);
+
+// Load and init HTML Loader Library
+require FRONTEND_PATH . "html_loader.php";
+$htmlloader = new HTMLLoader();
+
+// Check Login
+$call = new APICall("auth/isauth.php");
+$response = $call->response;
+
+if (!isset($response["data"]["login"])) {
+    $htmlloader->setPage("login");
+    $htmlloader->show();
+}

public/html_loader.php

@@ -91,9 +91,9 @@ class HTMLLoader {
         $html = file_get_contents(TEMPLATE_PATH . $template_dir . "/" . $page["dir_name"] . "/" . $page["html_file"]);
 
         if ($showAppName) {
-            $app_name = file_get_contents("http://" . APP_DOMAIN . "/api/settings/appname.php");
-            $app_name = json_decode($app_name, true);
-            $app_name = $app_name["data"]["application_name"];
+            $call = new APICall("settings/appname.php");
+            $response = $call->response;
+            $app_name = $response["data"]["application_name"];
 
             $html = str_replace("%appname%", $app_name, $html);
         }

public/index.php

@@ -40,4 +40,4 @@ if ($response["data"]["empty"]) {
     }
 }
 
-$htmlLoader->show(["%entrys%" => $html_block]);
+$htmlLoader->show(["%entrys%" => $html_block]);