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/skins/Standard.php

@@ -0,0 +1,57 @@
+<?php namespace Backend\Skins;
+
+use File;
+use Backend\Classes\Skin;
+use Winter\Storm\Router\Helper as RouterHelper;
+
+/**
+ * Standard skin information file.
+ *
+ * This skin uses the default paths always, there is no lookup required.
+ *
+ * @package winter\wn-backend-module
+ * @author Alexey Bobkov, Samuel Georges
+ */
+
+class Standard extends Skin
+{
+
+    /**
+     * @inheritDoc
+     */
+    public function __construct()
+    {
+        $this->skinPath = $this->defaultSkinPath = base_path() . '/modules/backend';
+        $this->publicSkinPath = $this->defaultPublicSkinPath = File::localToPublic($this->skinPath);
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function skinDetails()
+    {
+        return [
+            'name' => 'Default Skin'
+        ];
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getPath($path = null, $isPublic = false)
+    {
+        $path = RouterHelper::normalizeUrl($path);
+
+        return $isPublic
+            ? $this->defaultPublicSkinPath . $path
+            : $this->defaultSkinPath . $path;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getLayoutPaths()
+    {
+        return [$this->skinPath.'/layouts'];
+    }
+}