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

.devcontainer/local-features/bootstrap-winter/update-composer.php

@@ -0,0 +1,27 @@
+<?php
+$composerPath = dirname(__DIR__, 3) . '/composer.json';
+$composer = json_decode(file_get_contents($composerPath), true);
+
+$packages = [
+    'winter/wn-test-plugin' => 'dev-main',
+    'winter/wn-blog-plugin' => 'dev-main',
+    'winter/wn-blog-plugin' => 'dev-main',
+    'winter/wn-workshop-theme' => 'dev-main',
+];
+
+// Install Winter packages
+foreach ($packages as $package => $version) {
+    if (!in_array($package, array_keys($composer['require']))) {
+        $composer['require'][$package] = $version;
+    }
+}
+
+// Change Merge plugin config
+$composer['extra']['merge-plugin']['include'] = [
+    'plugins/*/*/composer.json',
+];
+
+file_put_contents(
+    $composerPath,
+    json_encode($composer, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES)
+);