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/system/controllers/updates/install.php

@@ -0,0 +1,49 @@
+<?php Block::put('breadcrumb') ?>
+    <ul>
+        <li><a href="<?= Backend::url('system/updates') ?>"><?= e(trans('system::lang.updates.menu_label')) ?></a></li>
+        <li><?= e(trans($this->pageTitle)) ?></li>
+    </ul>
+<?php Block::endPut() ?>
+
+<?php if (!$this->fatalError): ?>
+
+    <div class="control-tabs content-tabs tabs-flush" data-control="tab">
+        <ul class="nav nav-tabs">
+            <li class="<?= $activeTab == 'plugins' ? 'active' : '' ?>">
+                <a
+                    href="#tabPlugins"
+                    data-tab-url="<?= Backend::url('system/updates/install/plugins') ?>">
+                    <?= e(trans('system::lang.updates.plugins')) ?>
+                </a>
+            </li>
+            <li class="<?= $activeTab == 'themes' ? 'active' : '' ?>">
+                <a
+                    href="#tabThemes"
+                    data-tab-url="<?= Backend::url('system/updates/install/themes') ?>">
+                    <?= e(trans('system::lang.updates.themes')) ?>
+                </a>
+            </li>
+        </ul>
+        <div class="tab-content">
+            <div class="tab-pane <?= $activeTab == 'plugins' ? 'active' : '' ?>">
+                <div class="padded-container">
+                    <?= $this->makePartial('install_plugins') ?>
+                </div>
+            </div>
+            <div class="tab-pane <?= $activeTab == 'themes' ? 'active' : '' ?>">
+                <div class="padded-container">
+                    <?= $this->makePartial('install_themes') ?>
+                </div>
+            </div>
+        </div>
+    </div>
+
+<?php else: ?>
+
+    <div class="padded-container">
+        <p class="flash-message static error"><?= e($this->fatalError) ?></p>
+        <p><a href="<?= Backend::url('system/updates') ?>" class="btn btn-default"><?= e(trans('system::lang.settings.return')) ?></a></p>
+        <p><a href="<?= Backend::url('cms/themes') ?>" class="btn btn-default"><?= e(trans('cms::lang.theme.return')) ?></a></p>
+    </div>
+
+<?php endif ?>