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/cms/classes/layout/fields.yaml

@@ -0,0 +1,45 @@
+# ===================================
+#  Form Field Definitions
+# ===================================
+
+fields:
+    fileName:
+        label: cms::lang.editor.filename
+        span: left
+        attributes:
+            default-focus: 1
+
+    settings[description]:
+        label: cms::lang.editor.description
+        span: right
+
+    toolbar:
+        type: partial
+        path: layout_toolbar
+        cssClass: collapse-visible
+
+    components: Cms\FormWidgets\Components
+
+tabs:
+    cssClass: master-area
+
+secondaryTabs:
+    stretch: true
+    fields:
+        markup:
+            tab: cms::lang.editor.markup
+            stretch: true
+            type: codeeditor
+            language: twig
+
+        safemode_notice:
+            tab: cms::lang.editor.code
+            type: partial
+            hidden: true
+            cssClass: p-b-0
+
+        code:
+            tab: cms::lang.editor.code
+            stretch: true
+            type: codeeditor
+            language: php