Skip system files when finding content files

app/router.php

@@ -60,6 +60,9 @@ function findAllContentFiles(string $dir, string $lang, string $defaultLang): ar
     foreach ($files as $file) {
         if ($file === '.' || $file === '..') continue;
         
+        // Exclude system files from content
+        if ($file === 'index.php') continue;
+        
         $ext = pathinfo($file, PATHINFO_EXTENSION);
         if (!in_array($ext, $extensions)) continue;