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/ui/vendor/select2/WINTER-README.md

@@ -0,0 +1,18 @@
+There's a hack in select2.full.js. The hack prevents DOM element leakage through the event handler. Added/updated code:
+
+Line 3961, added .select2 namespace in the event handler registration:
+
+    this.$dropdownContainer.on('mousedown.select2', function (evt) {
+
+Lines 4120-4124. Added new method:
+
+```
+  AttachBody.prototype.destroy = function(decorated) {
+    this.$dropdownContainer.off('.select2')
+
+    decorated.call(this);
+  }
+```
+
+Filed an issue: https://github.com/select2/select2/issues/3774
+The issue was closed by the developers - the problem is going to be fixed in the upcoming 4.0.1 release.