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/twig/GetAttrAdjuster.php

@@ -0,0 +1,70 @@
+<?php namespace System\Twig;
+
+use System\Twig\Node\GetAttrNode;
+use Twig\Environment;
+use Twig\Node\Expression\GetAttrExpression;
+use Twig\Node\Node;
+use Twig\NodeVisitor\NodeVisitorInterface;
+
+/**
+ * GetAttrAdjuster swaps every attribute-access node (GetAttrExpression) for the custom
+ * GetAttrNode, so that method calls in sandbox mode route through
+ * SecurityPolicy::castMethodObjectToSafeObject. This is what enables the SafeCollection /
+ * SafePaginator protections. Only exact GetAttrExpression instances are swapped (not the
+ * replacement GetAttrNode), so the traversal never re-wraps.
+ *
+ * @package winter\wn-system-module
+ */
+class GetAttrAdjuster implements NodeVisitorInterface
+{
+    /**
+     * @inheritDoc
+     */
+    public function enterNode(Node $node, Environment $env): Node
+    {
+        if (get_class($node) !== GetAttrExpression::class) {
+            return $node;
+        }
+
+        $nodes = [
+            'node' => $node->getNode('node'),
+            'attribute' => $node->getNode('attribute'),
+        ];
+
+        if ($node->hasNode('arguments')) {
+            $nodes['arguments'] = $node->getNode('arguments');
+        }
+
+        $isDefinedTest = $node->isDefinedTestEnabled();
+
+        $attributes = [
+            'type' => $node->getAttribute('type'),
+            'ignore_strict_check' => $node->getAttribute('ignore_strict_check'),
+            'optimizable' => $node->getAttribute('optimizable'),
+        ];
+
+        $getAttrNode = new GetAttrNode($nodes, $attributes, $node->getTemplateLine());
+
+        if ($isDefinedTest) {
+            $getAttrNode->enableDefinedTest();
+        }
+
+        return $getAttrNode;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function leaveNode(Node $node, Environment $env): ?Node
+    {
+        return $node;
+    }
+
+    /**
+     * @inheritDoc
+     */
+    public function getPriority()
+    {
+        return 0;
+    }
+}