Extract Ladill Events as a standalone events suite at events.ladill.com.

Full control center for ticketed events, contributions, attendees, badges,
and programmes — not a QR utility clone. Includes SSO shell, import command,
and platform cutover runbook.

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

config/billing.php

@@ -0,0 +1,7 @@
+<?php
+
+return [
+    'api_url' => env('BILLING_API_URL', 'https://ladill.com/api/billing'),
+    'api_key' => env('BILLING_API_KEY_EVENTS'),
+    'service' => 'events',
+];