feat: VivesPOS landing on Winter CMS 1.2 — theme + plugin + Dockerfile

- Base: wintercms/winter branch 1.2 (full framework)
- Theme vivespos: Canvas 7 + Bootstrap 5 CDN, custom CSS
- Layout: deferred GTM/GA4 tracking, JSON-LD SoftwareApplication
- Partials: hero (offline-first), features, modes (offline/nube toggle),
  screenshots, pricing (3 planes), comparison, FAQ, CTA
- Plugin VivesPOS.Site with ContactForm
- Dockerfile: PHP 8.2 Apache, port 80, healthcheck
- Added winter/wn-pages, blog, sitemap, seo plugins
- Active theme set to vivespos

modules/system/tests/fixtures/config/cms.php

@@ -0,0 +1,10 @@
+<?php
+// Fixture used for `winter:env` unit tests in `tests/unit/system/console/WinterEnvTest.php
+
+return [
+    'enableRoutesCache' => false,
+    'enableAssetCache' => false,
+    'databaseTemplates' => false,
+    'linkPolicy' => 'detect',
+    'enableCsrfProtection' => true,
+];