Fix auth redirects for /dreamgirl subpath

Make login/logout and redirects work when deployed under a subdirectory (e.g. /dreamgirl).

Co-authored-by: Cursor <cursoragent@cursor.com>

logout.php

@@ -19,6 +19,6 @@ if (ini_get('session.use_cookies')) {
 }
 
 session_destroy();
-header('Location: /login.php');
+header('Location: ' . dreamgirl_url('login.php'));
 exit;