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/models/usergroup/columns.yaml

@@ -0,0 +1,36 @@
+# ===================================
+#  Column Definitions
+# ===================================
+
+columns:
+    name:
+        label: backend::lang.user.group.name_field
+        searchable: true
+
+    code:
+        label: backend::lang.user.group.code_field
+        searchable: true
+        invisible: true
+
+    description:
+        label: backend::lang.user.group.description_field
+        searchable: true
+
+    users_count:
+        label: backend::lang.user.group.users_count
+        relation: users_count
+        valueFrom: count
+        default: 0
+        sortable: false
+
+    created_at:
+        label: backend::lang.user.created_at
+        searchable: true
+        invisible: true
+        type: datetime
+
+    updated_at:
+        label: backend::lang.user.updated_at
+        searchable: true
+        invisible: true
+        type: datetime