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-container.php

@@ -0,0 +1,11 @@
+<div
+    class="form-group <?= $this->previewMode ? 'form-group-preview' : '' ?> <?= $field->type ?>-field span-<?= $field->span ?> <?= $field->required?'is-required':'' ?> <?= $field->stretch?'layout-relative':'' ?> <?= $field->cssClass ?>"
+    <?php if ($depends = $this->getFieldDepends($field)): ?>
+        data-field-depends="<?= $depends ?>"
+    <?php endif ?>
+    data-field-name="<?= $field->fieldName ?>"
+    <?= $field->getAttributes('container') ?>
+    id="<?= $field->getId('group') ?>"><?=
+    /* Must be on the same line for :empty selector */
+    trim($this->makePartial('field', ['field' => $field]))
+    ?></div>