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/controllers/index/index.php

@@ -0,0 +1,23 @@
+<?= Form::open(['class'=>'layout-relative dashboard-container']) ?>
+    <div id="dashReportContainer" class="report-container loading">
+        <!-- Loading -->
+        <div class="loading-indicator-container">
+            <div class="loading-indicator indicator-center">
+                <span></span>
+                <div><?= e(trans('backend::lang.list.loading')) ?></div>
+            </div>
+        </div>
+    </div>
+<?= Form::close() ?>
+
+<?php Block::put('head'); ?>
+<script>
+Snowboard.ready(() => {
+    Snowboard.request(null, 'onInitReportContainer', {
+        success: () => {
+            $('#dashReportContainer').removeClass('loading');
+        },
+    });
+});
+</script>
+<?php Block::endPut(true); ?>