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/assets/vendor/sweet-alert/sweet-alert.html

@@ -0,0 +1,39 @@
+<!-- Note: this file is only intended for development use! -->
+
+<div class="sweet-overlay"></div>
+
+
+<!-- SweetAlert box -->
+<div class="sweet-alert">
+
+  <div class="icon error">
+    <span class="x-mark">
+      <span class="line left"></span>
+      <span class="line right"></span>
+    </span>
+  </div>
+
+  <div class="icon warning">
+    <span class="body"></span>
+    <span class="dot"></span>
+  </div>
+
+  <div class="icon info"></div>
+
+  <div class="icon success">
+    <span class="line tip"></span>
+    <span class="line long"></span>
+    <div class="placeholder"></div>
+    <div class="fix"></div>
+  </div>
+
+  <div class="icon custom"></div>
+
+
+  <h2>Title</h2>
+  <p class="text-muted">Text</p>
+  <p>
+    <button class="cancel btn btn-lg btn-default">Cancel</button>
+    <button class="confirm btn btn-lg">OK</button>
+  </p>
+</div>