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/widgets/form/partials/_field_hint.php

@@ -0,0 +1,8 @@
+<?= $this->controller->makeHintPartial($field->getId(), $field->path ?: $field->fieldName, [
+    'formModel' => $formModel,
+    'formField' => $field,
+    'formValue' => $field->value,
+    'model'     => $formModel,
+    'field'     => $field,
+    'value'     => $field->value
+]) ?>