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/console/scaffold/formwidget/formwidget.stub

@@ -0,0 +1,59 @@
+<?php
+
+namespace {{studly_author}}\{{studly_plugin}}\FormWidgets;
+
+use Backend\Classes\FormWidgetBase;
+
+/**
+ * {{name}} Form Widget
+ */
+class {{studly_name}} extends FormWidgetBase
+{
+    /**
+     * @inheritDoc
+     */
+    protected $defaultAlias = '{{lower_author}}_{{lower_plugin}}_{{snake_name}}';
+
+    /**
+     * @inheritDoc
+     */
+    public function init()
+    {
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function render()
+    {
+        $this->prepareVars();
+        return $this->makePartial('{{lower_name}}');
+    }
+
+    /**
+     * Prepares the form widget view data
+     */
+    public function prepareVars()
+    {
+        $this->vars['name'] = $this->formField->getName();
+        $this->vars['value'] = $this->getLoadValue();
+        $this->vars['model'] = $this->model;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function loadAssets()
+    {
+        $this->addCss('css/{{lower_name}}.css', '{{author}}.{{plugin}}');
+        $this->addJs('js/{{lower_name}}.js', '{{author}}.{{plugin}}');
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getSaveValue($value)
+    {
+        return $value;
+    }
+}