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.

auth/logout.php

@@ -0,0 +1,44 @@
+<?php
+/**
+ * Fociz Uitloggen
+ */
+
+require_once __DIR__ . '/../includes/auth.php';
+start_secure_session();
+
+// Vernietig persistente login in database
+if (!empty($_SESSION['user_id'])) {
+    try {
+        $db = get_db_connection();
+        ensure_remember_token_columns($db);
+        $stmt = $db->prepare("UPDATE users SET remember_token = NULL, remember_token_expires_at = NULL WHERE id = ?");
+        $stmt->execute([$_SESSION['user_id']]);
+    } catch (Throwable $e) {
+        // Stil negeren bij uitloggen
+    }
+}
+
+// Verwijder remember cookie
+clear_remember_cookie();
+
+// Vernietig alle sessie variabelen
+$_SESSION = [];
+
+if (ini_get("session.use_cookies")) {
+    $params = session_get_cookie_params();
+    setcookie(
+        session_name(),
+        '',
+        time() - 42000,
+        $params["path"],
+        $params["domain"],
+        $params["secure"],
+        $params["httponly"]
+    );
+}
+
+session_destroy();
+
+header('Location: /auth/login.php');
+exit;
+