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

.github/workflows/utilities/library-switcher

@@ -0,0 +1,18 @@
+#!/usr/bin/env php
+<?php
+/**
+ * Storm library switch for CI
+ *
+ * Switches the version of the Storm library being required through Composer. The only argument is the branch or tag
+ * to switch to.
+ */
+if (empty($argv[1])) {
+    echo 'You must provide a version to switch the library dependency to.';
+    echo "\n";
+    exit(1);
+}
+
+$composer = json_decode(file_get_contents(getcwd() . '/composer.json'), true);
+$composer['require']['winter/storm'] = $argv[1];
+
+file_put_contents(getcwd() . '/composer.json', json_encode($composer, JSON_PRETTY_PRINT | JSON_UNESCAPED_SLASHES));