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

.env.example

@@ -0,0 +1,13 @@
+APP_ENV=production
+APP_DEBUG=false
+APP_KEY=
+APP_URL=http://localhost
+
+DB_CONNECTION=sqlite
+DB_DATABASE=storage/database.sqlite
+
+CACHE_STORE=file
+SESSION_DRIVER=file
+QUEUE_CONNECTION=sync
+
+MAIL_MAILER=log