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/users/_btn_impersonate.php

@@ -0,0 +1,14 @@
+<?php if ($this->user->hasAccess('backend.impersonate_users')): ?>
+    <div class="loading-indicator-container">
+        <button
+            type="button"
+            data-request="onImpersonateUser"
+            data-load-indicator="<?= e(trans('backend::lang.account.impersonate_working')) ?>"
+            data-request-confirm="<?= e(trans('backend::lang.account.impersonate_confirm')) ?>"
+            class="btn btn-danger wn-icon-user-secret"
+            style="width: 100%; text-align: center"
+        >
+            <?= e(trans('backend::lang.account.impersonate')) ?>
+        </button>
+    </div>
+<?php endif ?>