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/composer.json

@@ -0,0 +1,39 @@
+{
+    "name": "winter/wn-backend-module",
+    "type": "winter-module",
+    "description": "Backend module for Winter CMS",
+    "homepage": "https://wintercms.com",
+    "keywords": ["winter cms", "winter", "backend"],
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Alexey Bobkov",
+            "email": "aleksey.bobkov@gmail.com",
+            "role": "Original Author"
+        },
+        {
+            "name": "Samuel Georges",
+            "email": "daftspunky@gmail.com",
+            "role": "Original Author"
+        },
+        {
+            "name": "Luke Towers",
+            "email": "wintercms@luketowers.ca",
+            "role": "Lead Maintainer"
+        }
+    ],
+    "require": {
+        "php": ">=8.1",
+        "composer/installers": "~1.11.0",
+        "laravel/framework": "^9.1"
+    },
+    "replace": {
+        "october/backend": "1.1.*"
+    },
+    "autoload": {
+        "psr-4": {
+            "Backend\\": ""
+        }
+    },
+    "minimum-stability": "dev"
+}