Add temporary error logging and debugging output in index.php and register.php

index.php

@@ -1,4 +1,10 @@
 <?php 
+// Temporäre Fehlerausgabe und Logging für Debugzwecke
+ini_set('display_errors', '0');
+ini_set('log_errors', '1');
+ini_set('error_reporting', (string)E_ALL);
+ini_set('error_log', __DIR__ . '/php-error.log');
+
 if (isset($_REQUEST['q']) && substr($_REQUEST['q'], -4) === '.php') {
     $url = substr($_REQUEST['q'], 0, -4);
     header('Location: ' . $url, true, 301);