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/cms/controllers/index/_form_page.php

@@ -0,0 +1,16 @@
+<?= Form::open([
+        'class' => 'layout',
+        'data-change-monitor' => 'true',
+        'data-window-close-confirm' => e(trans('backend::lang.form.confirm_tab_close')),
+        'data-inspector-external-parameters' => true
+]) ?>
+    <?= $form->render() ?>
+
+    <input type="hidden" value="<?= e($form->alias) ?>" name="formWidgetAlias" />
+    <input type="hidden" value="<?= ($templateType) ?>" name="templateType" />
+    <input type="hidden" value="<?= ($templatePath) ?>" name="templatePath" />
+    <input type="hidden" value="<?= ($templateTheme) ?>" name="theme" />
+    <input type="hidden" value="<?= ($templateMtime) ?>" name="templateMtime" />
+    <input type="hidden" value="0" name="templateForceSave" />
+
+<?= Form::close() ?>