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/lang/lang.stub

@@ -0,0 +1,10 @@
+/*
+ * This file has been compiled from: /modules/system/lang/{{locale}}/client.php
+ */
+if ($.wn === undefined) $.wn = {}
+if ($.oc === undefined) $.oc = $.wn
+if ($.wn.langMessages === undefined) $.wn.langMessages = {}
+$.wn.langMessages['{{locale}}'] = $.extend(
+    $.wn.langMessages['{{locale}}'] || {},
+    {{messages}}
+);