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/_manage_pivot.php

@@ -0,0 +1,32 @@
+<div id="relationManagePivotPopup" data-request-data="_relation_field: '<?= $relationField ?>'">
+    <?= Form::open() ?>
+        <div class="modal-header">
+            <button type="button" class="close" data-dismiss="popup">&times;</button>
+            <h4 class="modal-title"><?= e(trans($relationManageTitle, ['name'=>trans($relationLabel)])) ?></h4>
+        </div>
+        <?php if (!$relationSearchWidget): ?>
+            <div class="modal-body">
+                <p><?= e(trans('backend::lang.relation.help')) ?></p>
+            </div>
+        <?php endif ?>
+        <div class="list-flush">
+            <?php if ($relationSearchWidget): ?>
+                <?= $relationSearchWidget->render() ?>
+            <?php endif ?>
+            <?php if ($relationManageFilterWidget): ?>
+                <?= $relationManageFilterWidget->render() ?>
+            <?php endif ?>
+            <?= $relationManageWidget->render() ?>
+        </div>
+
+        <div class="modal-footer">
+            <?= $this->relationMakePartial('manage_pivot_footer') ?>
+        </div>
+    <?= Form::close() ?>
+</div>
+<script>
+    setTimeout(
+            function(){ $('#relationManagePivotPopup input.form-control:first').focus() },
+            310
+    )
+</script>