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/behaviors/relationcontroller/partials/_button_remove.php

@@ -0,0 +1,24 @@
+<?php if ($relationViewMode == 'single'): ?>
+    <button
+        class="btn btn-sm btn-secondary wn-icon-minus"
+        data-request="onRelationButtonRemove"
+        data-request-success="$.wn.relationBehavior.changed('<?= e($relationField) ?>', 'removed')"
+        data-stripe-load-indicator>
+        <?= e(trans($text)) ?>
+    </button>
+<?php else: ?>
+    <button
+        class="btn btn-sm btn-secondary wn-icon-minus"
+        onclick="$(this).data('request-data', {
+            checked: $('#<?= $this->relationGetId('view') ?> .control-list').listWidget('getChecked')
+        })"
+        disabled="disabled"
+        data-request="onRelationButtonRemove"
+        data-request-success="$.wn.relationBehavior.changed('<?= e($relationField) ?>', 'removed')"
+        data-trigger-action="enable"
+        data-trigger="#<?= $this->relationGetId('view') ?> .control-list input[type=checkbox]"
+        data-trigger-condition="checked"
+        data-stripe-load-indicator>
+        <?= e(trans($text)) ?>
+    </button>
+<?php endif ?>