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/assets/js/vendor/jquery.waterfall.js

@@ -0,0 +1,63 @@
+(function($) {
+/**
+ * Runs functions given in arguments in series, each functions passing their results to the next one.
+ * Return jQuery Deferred object.
+ *
+ * @example
+ * $.waterfall(
+ *    function() { return $.ajax({url : first_url}) },
+ *    function() { return $.ajax({url : second_url}) },
+ *    function() { return $.ajax({url : another_url}) }
+ *).fail(function() {
+ *    console.log(arguments)
+ *).done(function() {
+ *    console.log(arguments)
+ *})
+ *
+ * @example2
+ * event_chain = [];
+ * event_chain.push(function() { var deferred = $.Deferred(); deferred.resolve(); return deferred; });
+ * $.waterfall.apply(this, event_chain).fail(function(){}).done(function(){});
+ * 
+ * @author Dmitry (dio) Levashov, dio@std42.ru
+ * @return jQuery.Deferred
+ */
+$.waterfall = function() {
+    var steps   = [],
+        dfrd    = $.Deferred(),
+        pointer = 0;
+
+    $.each(arguments, function(i, a) {
+        steps.push(function() {
+            var args = [].slice.apply(arguments), d;
+
+            if (typeof(a) == 'function') {
+                if (!((d = a.apply(null, args)) && d.promise)) {
+                    d = $.Deferred()[d === false ? 'reject' : 'resolve'](d);
+                }
+            } else if (a && a.promise) {
+                d = a;
+            } else {
+                d = $.Deferred()[a === false ? 'reject' : 'resolve'](a);
+            }
+
+            d.fail(function() {
+                dfrd.reject.apply(dfrd, [].slice.apply(arguments));
+            })
+            .done(function(data) {
+                pointer++;
+                args.push(data);
+
+                pointer == steps.length
+                    ? dfrd.resolve.apply(dfrd, args)
+                    : steps[pointer].apply(null, args);
+            });
+        });
+    });
+
+    steps.length ? steps[0]() : dfrd.resolve();
+
+    return dfrd;
+}
+
+})(jQuery);