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/sensitive/assets/less/sensitive.less

@@ -0,0 +1,10 @@
+@import "../../../../assets/less/core/boot.less";
+
+div[data-control="sensitive"] {
+    a[data-toggle],
+    a[data-copy] {
+        box-shadow: none;
+        border: 1px solid @input-group-addon-border-color;
+        border-left: 0;
+    }
+}