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/formwidgets/RelationManager.php

@@ -0,0 +1,84 @@
+<?php
+
+namespace Backend\FormWidgets;
+
+use Backend\Classes\FormField;
+use Backend\Classes\FormWidgetBase;
+use Illuminate\Support\Facades\Lang;
+use Winter\Storm\Exception\SystemException;
+
+class RelationManager extends FormWidgetBase
+{
+    /**
+     * @inheritDoc
+     */
+    protected $defaultAlias = 'relationmanager';
+
+    /**
+     * Disables the ability to add, update, delete or create relations.
+     */
+    protected ?bool $readOnly = null;
+
+    /**
+     * Path to controller action to open a record.
+     */
+    protected ?string $recordUrl = null;
+
+    /**
+     * Custom JavaScript code to execute when clicking on a record.
+     */
+    protected ?string $recordOnClick = null;
+
+    /**
+     * Relation name if different from the field name.
+     */
+    protected string $relation = '';
+
+    public function init(): void
+    {
+        $this->fillFromConfig([
+            'readOnly',
+            'recordUrl',
+            'recordOnClick',
+            'relation',
+        ]);
+
+        if (!isset($this->readOnly) && $this->config->previewMode) {
+            $this->readOnly = $this->config->previewMode;
+        }
+    }
+
+    public function render()
+    {
+        if (!$this->controller->isClassExtendedWith(\Backend\Behaviors\RelationController::class)) {
+            $error = Lang::get('backend::lang.relation.missing_behavior', [
+                'field' => $this->formField->fieldName,
+                'controller' => get_class($this->controller),
+            ]);
+            throw new SystemException($error);
+        }
+
+        $options = [];
+
+        if (!is_null($this->readOnly)) {
+            $options['readOnly'] = $this->readOnly;
+        }
+
+        if (!is_null($this->recordUrl)) {
+            $options['recordUrl'] = $this->recordUrl;
+        }
+
+        if (!is_null($this->recordOnClick)) {
+            $options['recordOnClick'] = $this->recordOnClick;
+        }
+
+        $relation = $this->relation ?: $this->formField->fieldName;
+
+        return $this->controller->relationRender($relation, $options);
+    }
+
+    public function getSaveValue($value)
+    {
+        return FormField::NO_SAVE_DATA;
+    }
+}