feat(dev): environment ribbon and one-click dev login on the public site and auth pages

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

site/includes/footer.php

@@ -39,5 +39,6 @@
 <?= script_tag('assets/vendor/jquery/jquery-3.7.1.min.js') ?>
 <?= script_tag('assets/vendor/bootstrap5/js/bootstrap.bundle.min.js') ?>
 <?= script_tag('site/assets/js/main.js') ?>
+<?php include dirname(__DIR__, 2) . '/includes/dev_toolbar.php';   // DEV ONLY: sem saída fora de dev ?>
 </body>
 </html>