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/cms/controllers/themes/download.php

@@ -0,0 +1,13 @@
+<?php Block::put('breadcrumb') ?>
+    <ul>
+        <li><a href="<?= Backend::url('cms/themes') ?>"><?= e(trans('cms::lang.theme.theme_title')) ?></a></li>
+        <li><?= e(trans($this->pageTitle)) ?></li>
+    </ul>
+<?php Block::endPut() ?>
+
+<?php if ($this->fatalError): ?>
+
+    <p class="flash-message static error"><?= e($this->fatalError) ?></p>
+    <p><a href="<?= Backend::url('cms/themes') ?>" class="btn btn-default"><?= e(trans('cms::lang.theme.return')) ?></a></p>
+
+<?php endif ?>