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/assets/js/snowboard/main/InnerProxyHandler.js

@@ -0,0 +1,43 @@
+/**
+ * Internal proxy for Snowboard.
+ *
+ * This handler wraps the Snowboard instance that is passed to the constructor of plugin instances.
+ * It prevents access to the following methods:
+ *  - `attachAbstracts`: No need to attach abstracts again.
+ *  - `loadUtilties`: No need to load utilities again.
+ *  - `initialise`: Snowboard is already initialised.
+ *  - `initialiseSingletons`: Singletons are already initialised.
+ */
+export default {
+    get(target, prop, receiver) {
+        if (typeof prop === 'string') {
+            const propLower = prop.toLowerCase();
+
+            if (['attachAbstracts', 'loadUtilities', 'initialise', 'initialiseSingletons'].includes(prop)) {
+                throw new Error(`You cannot use the "${prop}" Snowboard method within a plugin.`);
+            }
+
+            if (target.hasPlugin(propLower)) {
+                return (...params) => Reflect.get(target, 'plugins')[propLower].getInstance(...params);
+            }
+        }
+
+        return Reflect.get(target, prop, receiver);
+    },
+
+    has(target, prop) {
+        if (typeof prop === 'string') {
+            const propLower = prop.toLowerCase();
+
+            if (['attachAbstracts', 'loadUtilities', 'initialise', 'initialiseSingletons'].includes(prop)) {
+                return false;
+            }
+
+            if (target.hasPlugin(propLower)) {
+                return true;
+            }
+        }
+
+        return Reflect.has(target, prop);
+    },
+};