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/NestedForm.php

@@ -0,0 +1,85 @@
+<?php namespace Backend\FormWidgets;
+
+use Backend\Classes\FormWidgetBase;
+use Backend\Widgets\Form;
+
+/**
+ * Nested Form
+ * Renders a nested form bound to a jsonable field of a model.
+ *
+ * @package winter\wn-backend-module
+ * @author Sascha Aeppli
+ */
+class NestedForm extends FormWidgetBase
+{
+    /**
+     * @inheritDoc
+     */
+    protected $defaultAlias = 'nestedform';
+
+    /**
+     * @var array Form configuration
+     */
+    public $form;
+
+    /**
+     * @var bool defines if the nested form is styled like a panel (default true).
+     */
+    public $usePanelStyles = true;
+
+    /**
+     * @var Form form widget reference
+     */
+    protected $formWidget;
+
+    /**
+     * @inheritDoc
+     */
+    public function init()
+    {
+        $this->fillFromConfig([
+            'form',
+            'usePanelStyles',
+        ]);
+
+        if ($this->formField->disabled) {
+            $this->previewMode = true;
+        }
+
+        $config = $this->makeConfig($this->form);
+        $config->model = $this->model;
+        $config->data = $this->getLoadValue();
+        $config->alias = $this->alias . $this->defaultAlias;
+        $config->arrayName = $this->getFieldName();
+        $config->isNested = true;
+
+        if (object_get($this->getParentForm()->config, 'enableDefaults') === true) {
+            $config->enableDefaults = true;
+        }
+
+        $widget = $this->makeWidget(Form::class, $config);
+        $widget->previewMode = $this->previewMode;
+        $widget->bindToController();
+
+        $this->formWidget = $widget;
+    }
+
+    protected function loadAssets()
+    {
+        $this->addCss('css/nestedform.css', 'core');
+    }
+
+    /**
+     * @inheritdoc
+     */
+    public function render()
+    {
+        $this->prepareVars();
+        return $this->makePartial('nestedform');
+    }
+
+    public function prepareVars()
+    {
+        $this->formWidget->previewMode = $this->previewMode;
+    }
+}