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/backend/formwidgets/nestedform/assets/css/nestedform.css

@@ -0,0 +1,6 @@
+.nested-form{position:relative;min-height:30px}
+.nested-form .control-tabs.primary-tabs .nav-tabs{margin:0 !important}
+.nested-form.panel-styles{margin-top:5px;padding:1em 1.25em 0 1.25em !important;background:#f5f5f5;border:1px solid #d1d6d9;border-radius:3px;box-shadow:inset 0 1px 0 rgba(209,214,217,0.25),0 1px 0 rgba(255,255,255,.5)}
+.nested-form.panel-styles .control-tabs.primary-tabs .nav-tabs>li.active>a:before{background-color:#f5f5f5;border-color:#f5f5f5}
+.nested-form.panel-styles .control-tabs.primary-tabs .nav-tabs>li>a>span.title:before,
+.nested-form.panel-styles .control-tabs.primary-tabs .nav-tabs>li>a>span.title:after{background-color:#f5f5f5}