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_dropdown.php

@@ -0,0 +1,43 @@
+<?php
+$fieldOptions = $field->options();
+if ($fieldOptions instanceof Illuminate\Support\Collection) {
+    $fieldOptions = $fieldOptions->all();
+}
+?>
+
+<!-- Dropdown -->
+<?php if ($this->previewMode || $field->readOnly): ?>
+    <div class="form-control" <?= $field->readOnly ? 'disabled="disabled"' : ''; ?>>
+        <?= (isset($fieldOptions[$field->value])) ? e(trans($fieldOptions[$field->value])) : '' ?>
+    </div>
+    <input type="hidden" name="<?= $field->getName() ?>" value="<?= $field->value ?>">
+<?php else:
+    $emptyOption = $field->getConfig('emptyOption', $field->placeholder);
+    $options = $field->getAttributes(htmlBuild:false);
+    $options['id'] = $field->getId();
+    $options['class'] = 'form-control custom-select';
+    if ($field->getConfig('showSearch', true) === false) {
+        $options['class'] .= ' select-no-search';
+    }
+    if ($field->getConfig('allowCustom', false)) {
+        $options['class'] .= ' select-modifiable';
+    }
+    if ($emptyOption) {
+        $options['emptyOption'] = e(trans($emptyOption));
+    }
+    if ($field->placeholder) {
+        $options['data-placeholder'] = e(trans($field->placeholder));
+    }
+    foreach ($fieldOptions as $key => &$value) {
+        if (is_string($value) && str_contains($value, '::')) {
+            $value = e(trans($value));
+        }
+    }
+    ?>
+    <?= Form::select(
+        name: $field->getName(),
+        list: $fieldOptions,
+        selected: $field->value,
+        options: $options
+    ) ?>
+<?php endif ?>