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/tests/fixtures/plugins/winter/tester/components/MainMenu.php

@@ -0,0 +1,19 @@
+<?php namespace Winter\Tester\Components;
+
+use Cms\Classes\ComponentBase;
+
+class MainMenu extends ComponentBase
+{
+    public function componentDetails()
+    {
+        return [
+            'name' => 'Menu Dummy Component',
+            'description' => 'Displays a really cool menu.'
+        ];
+    }
+
+    public function menuItems()
+    {
+        return ['Home', 'Blog', 'About', 'Contact'];
+    }
+}