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/inspector.validator.required.js

@@ -0,0 +1,35 @@
+/*
+ * Inspector required validator.
+ */
++function ($) { "use strict";
+
+    var Base = $.wn.inspector.validators.base,
+        BaseProto = Base.prototype
+
+    var RequiredValidator = function(options) {
+        Base.call(this, options)
+
+        this.defaultMessage = 'The property is required.'
+    }
+
+    RequiredValidator.prototype = Object.create(BaseProto)
+    RequiredValidator.prototype.constructor = Base
+
+    RequiredValidator.prototype.isValid = function(value) {
+        if (value === undefined || value === null) {
+            return this.getMessage()
+        }
+
+        if (typeof value === 'boolean') {
+            return value ? null : this.getMessage()
+        }
+
+        if (typeof value === 'object') {
+            return !$.isEmptyObject(value) ? null : this.getMessage()
+        }
+
+        return $.trim(String(value)).length > 0 ? null : this.getMessage()
+    }
+
+    $.wn.inspector.validators.required = RequiredValidator
+}(window.jQuery);