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/models/mailbrandsetting/sample_template.php

@@ -0,0 +1,45 @@
+# {{texts.heading}} 1
+
+{{texts.paragraph|raw}}
+
+## {{texts.heading}} 2
+
+{% partial 'table' body %}
+| {{texts.table.item}}          | {{texts.table.description}}   | {{texts.table.price}}    |
+|:------------- |:-------------:| --------:|
+| {{texts.table.item}} 1        | {{texts.table.centered}}      | $10      |
+| {{texts.table.item}} 2        | {{texts.table.right_aligned}} | $20      |
+{% endpartial %}
+
+### {{texts.heading}} 3
+
+{{texts.paragraph|raw}}
+
+{% partial 'button' url='javascript:;' body %}
+{{texts.buttons.primary}}
+{% endpartial %}
+
+{% partial 'button' type='positive' url='javascript:;' body %}
+{{texts.buttons.positive}}
+{% endpartial %}
+
+{% partial 'button' type='negative' url='javascript:;' body %}
+{{texts.buttons.negative}}
+{% endpartial %}
+
+{% partial 'panel' body %}
+{{texts.panel}}
+{% endpartial %}
+
+{{texts.more}}
+
+{% partial 'promotion' body %}
+{{texts.promotion}}
+{% endpartial %}
+
+{{texts.thanks}},
+{{ appName }}
+
+{% partial 'subcopy' body %}
+{{texts.subcopy}}
+{% endpartial %}