Redesign as VM webshop with NetBox virtualization integration

- Split single-page into 3 pages:
  - index.php: product catalog with VM size cards
  - create.php: order form (name, domain, description)
  - requests.php: request history with pagination
- Rewrite NetBox integration to create Virtual Machines
  (/virtualization/virtual-machines/) instead of DCIM devices
- Add netbox_integration/netbox_api.php: NetBoxClient with
  createVirtualMachine(), findCluster(), findTag(), getList()
- Generate new sleek product-card images (420x280) with
  aligned spec boxes (vcpus/ram/disk)
- Add webshop CSS: product cards, nav links, hero section,
  order layout, responsive grid
- Update redirects: send.php -> requests.php, cancel.php -> requests.php
- Update E2E test for new page structure
- Add .gitignore, deploy-local.sh, setup_database.sql to repo

logout.php

@@ -1,7 +1,10 @@
 <?php
-session_start();
+declare(strict_types=1);
+
+require __DIR__ . '/config.php';
+start_app_session();
 session_regenerate_id(true);
 session_destroy();
-header('Location: login.php');
+
+header('Location: /login.php');
 exit;
-?>