Add roadmap management, service worker, and user invitation features

- Implemented roadmap.php for managing roadmap items with filtering options by quarter and status.
- Added a service worker (sw.js) to handle push notifications and click events for calendar appointments.
- Created users.php for admin to manage team members and invitations, including user creation and deletion functionalities.

integrations.php

@@ -0,0 +1,19 @@
+<?php
+/**
+ * Fociz Integraties Doorverwijzer
+ * Beheerders worden automatisch doorgeleid naar Systeembeheer (/admin.php).
+ * Collega's worden automatisch doorgeleid naar hun Persoonlijk Profiel (/profile.php).
+ */
+
+require_once __DIR__ . '/includes/auth.php';
+
+$user = require_auth();
+
+$queryString = !empty($_SERVER['QUERY_STRING']) ? '?' . $_SERVER['QUERY_STRING'] : '';
+
+if ($user['role'] === 'ADMIN') {
+    header('Location: /admin.php' . $queryString);
+} else {
+    header('Location: /profile.php' . $queryString);
+}
+exit;