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/cms/controllers/themes/_theme_list.php

@@ -0,0 +1,31 @@
+<?php
+    $themes = Cms\Classes\Theme::all();
+?>
+<?php foreach ($themes as $index => $theme): ?>
+
+    <div id="themeListItem-<?= $theme->getId() ?>" class="layout-row min-size <?= $theme->isActiveTheme() ? 'active' : null ?>">
+        <?= $this->makePartial('theme_list_item', ['theme' => $theme]) ?>
+    </div>
+
+<?php endforeach ?>
+
+<div class="layout-row links">
+    <div class="layout-cell theme-thumbnail">
+        <!-- Spacer -->
+    </div>
+    <div class="layout-cell theme-description">
+        <a
+            class="create-new-theme"
+            data-control="popup"
+            data-handler="onLoadCreateForm"
+            data-size="huge"
+            href="javascript:;">
+            <?= e(trans('cms::lang.theme.create_new_blank_theme')) ?>
+        </a>
+        <a
+            class="find-more-themes"
+            href="<?= Backend::url('system/updates/install/themes') ?>">
+            <?= e(trans('cms::lang.theme.find_more_themes')) ?>
+        </a>
+    </div>
+</div>