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/layouts/form-with-sidebar.php

@@ -0,0 +1,32 @@
+<div class="layout responsive-sidebar">
+    <div class="layout-cell">
+
+        <div class="layout">
+            <?php if ($breadcrumbContent = Block::placeholder('breadcrumb')): ?>
+                <!-- Breadcrumb -->
+                <div class="control-breadcrumb breadcrumb-flush">
+                    <?= $breadcrumbContent ?>
+                </div>
+            <?php endif ?>
+
+            <!-- Content -->
+            <div class="layout-row">
+                <div class="padded-container layout">
+                    <?= Block::placeholder('form-contents') ?>
+                </div>
+            </div>
+        </div>
+
+    </div>
+    <div class="layout-cell w-300 form-sidebar control-scrollpanel">
+        <div class="layout-relative">
+            <div class="layout-absolute">
+                <div class="control-scrollbar" data-control="scrollbar">
+                    <div class="padded-container">
+                        <?= Block::placeholder('form-sidebar') ?>
+                    </div>
+                </div>
+            </div>
+        </div>
+    </div>
+</div>