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/assets/js/snowboard/snowboard.base.js

@@ -0,0 +1,14 @@
+import Snowboard from './main/Snowboard';
+import ProxyHandler from './main/ProxyHandler';
+
+((window) => {
+    const snowboard = new Proxy(
+        new Snowboard(),
+        ProxyHandler,
+    );
+
+    // Cover all aliases
+    window.snowboard = snowboard;
+    window.Snowboard = snowboard;
+    window.SnowBoard = snowboard;
+})(window);