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

themes/demo/assets/javascript/app.js

@@ -0,0 +1,48 @@
+/*
+ * Application
+ */
+
+$(document).tooltip({
+    selector: "[data-toggle=tooltip]"
+})
+
+/*
+ * Auto hide navbar
+ */
+jQuery(document).ready(function($){
+    var $header = $('.navbar-autohide'),
+        scrolling = false,
+        previousTop = 0,
+        currentTop = 0,
+        scrollDelta = 10,
+        scrollOffset = 150
+
+    $(window).on('scroll', function(){
+        if (!scrolling) {
+            scrolling = true
+
+            if (!window.requestAnimationFrame) {
+                setTimeout(autoHideHeader, 250)
+            }
+            else {
+                requestAnimationFrame(autoHideHeader)
+            }
+        }
+    })
+
+    function autoHideHeader() {
+        var currentTop = $(window).scrollTop()
+
+        // Scrolling up
+        if (previousTop - currentTop > scrollDelta) {
+            $header.removeClass('is-hidden')
+        }
+        else if (currentTop - previousTop > scrollDelta && currentTop > scrollOffset) {
+            // Scrolling down
+            $header.addClass('is-hidden')
+        }
+
+        previousTop = currentTop
+        scrolling = false
+    }
+});