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/console/scaffold/theme/tailwind/theme.stub

@@ -0,0 +1,21 @@
+name: "{{code}}"
+description: "No description provided yet..."
+author: "Winter CMS Scaffold"
+homepage: "https://example.com"
+code: "{{code}}"
+form:
+    fields:
+        googleanalytics_id:
+            label: themes.{{code}}::lang.options.googleanalytics_id
+            type: text
+            span: full
+        color_primary:
+            label: themes.{{code}}::lang.options.color_primary
+            type: colorpicker
+            span: left
+            default: "#103141"
+        color_secondary:
+            label: themes.{{code}}::lang.options.color_secondary
+            type: colorpicker
+            span: right
+            default: "#2DA7C7"