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/js/flashmessage.js

@@ -0,0 +1,77 @@
+/*
+ * The flash message.
+ *
+ * Documentation: ../docs/flashmessage.md
+ *
+ * Require:
+ *  - bootstrap/transition
+ */
++function ($) { "use strict";
+
+    var FlashMessage = function (options, el) {
+        var
+            options = $.extend({}, FlashMessage.DEFAULTS, options),
+            $element = $(el)
+
+        $('body > p.flash-message').remove()
+
+        if ($element.length == 0) {
+            $element = $('<p />').addClass(options.class).html(options.text)
+        }
+
+        $element.addClass('flash-message fade')
+        $element.attr('data-control', null)
+        $element.append('<button type="button" class="close" aria-hidden="true">&times;</button>')
+        $element.on('click', 'button', remove)
+        $element.on('click', remove)
+
+        $(document.body).append($element)
+
+        setTimeout(function() {
+            $element.addClass('in')
+        }, 100)
+
+        var timer = window.setTimeout(remove, options.interval * 1000)
+
+        function removeElement() {
+            $element.remove()
+        }
+
+        function remove() {
+            window.clearInterval(timer)
+
+            $element.removeClass('in')
+            $.support.transition && $element.hasClass('fade')
+                ? $element
+                    .one($.support.transition.end, removeElement)
+                    .emulateTransitionEnd(500)
+                : removeElement()
+        }
+    }
+
+    FlashMessage.DEFAULTS = {
+        class: 'success',
+        text: 'Default text',
+        interval: 5
+    }
+
+    // FLASH MESSAGE PLUGIN DEFINITION
+    // ============================
+
+     if ($.wn === undefined)
+        $.wn = {}
+    if ($.oc === undefined)
+        $.oc = $.wn
+
+    $.wn.flashMsg = FlashMessage
+
+    // FLASH MESSAGE DATA-API
+    // ===============
+
+    $(document).render(function(){
+        $('[data-control=flash-message]').each(function(){
+            $.wn.flashMsg($(this).data(), this)
+        })
+    })
+
+}(window.jQuery);