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/Media.php

@@ -0,0 +1,38 @@
+<?php namespace Backend\Controllers;
+
+use BackendMenu;
+use Backend\Classes\Controller;
+use Backend\Widgets\MediaManager;
+
+/**
+ * Backend Media Manager
+ *
+ * @package winter\wn-backend-module
+ * @author Alexey Bobkov, Samuel Georges
+ */
+class Media extends Controller
+{
+    /**
+     * @var array Permissions required to view this page.
+     */
+    public $requiredPermissions = ['media.*'];
+
+    /**
+     * Constructor.
+     */
+    public function __construct()
+    {
+        parent::__construct();
+
+        BackendMenu::setContext('Winter.Backend', 'media', true);
+        $this->pageTitle = 'backend::lang.media.menu_label';
+
+        $manager = new MediaManager($this, 'manager');
+        $manager->bindToController();
+    }
+
+    public function index()
+    {
+        $this->bodyClass = 'compact-container';
+    }
+}