reorder folders for easy 1:1 upload to boogie server

development-system/public/booking-config.php.example

@@ -0,0 +1,9 @@
+<?php
+
+declare(strict_types=1);
+
+// Copy this file to booking-config.php, then insert the production database URL.
+// booking-config.php is intentionally excluded from Git and denied by public/.htaccess.
+return [
+    'database_url' => 'mysql://USER:PASSWORD@database-host:3306/booking_database',
+];