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/mailtemplates/index.php

@@ -0,0 +1,30 @@
+<div class="control-tabs content-tabs tabs-flush" data-control="tab">
+    <ul class="nav nav-tabs">
+        <li class="<?= $activeTab == 'templates' ? 'active' : '' ?>">
+            <a href="#templates" data-tab-url="<?= Backend::url('system/mailtemplates/index/templates') ?>">
+                <?= e(trans('system::lang.mail_templates.templates')) ?>
+            </a>
+        </li>
+        <li class="<?= $activeTab == 'layouts' ? 'active' : '' ?>">
+            <a href="#layouts" data-tab-url="<?= Backend::url('system/mailtemplates/index/layouts') ?>">
+                <?= e(trans('system::lang.mail_templates.layouts')) ?>
+            </a>
+        </li>
+        <li class="<?= $activeTab == 'partials' ? 'active' : '' ?>">
+            <a href="#partials" data-tab-url="<?= Backend::url('system/mailtemplates/index/partials') ?>">
+                <?= e(trans('system::lang.mail_templates.partials')) ?>
+            </a>
+        </li>
+    </ul>
+    <div class="tab-content">
+        <div class="tab-pane <?= $activeTab == 'templates' ? 'active' : '' ?>">
+            <?= $this->listRender('templates') ?>
+        </div>
+        <div class="tab-pane <?= $activeTab == 'layouts' ? 'active' : '' ?>">
+            <?= $this->listRender('layouts') ?>
+        </div>
+        <div class="tab-pane <?= $activeTab == 'partials' ? 'active' : '' ?>">
+            <?= $this->listRender('partials') ?>
+        </div>
+    </div>
+</div>