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/themes/_theme_fields_form.php

@@ -0,0 +1,56 @@
+<?= Form::ajax('onSaveFields', [
+    'id' => 'themeFieldsForm',
+    'data-popup-load-indicator' => true
+]) ?>
+
+    <input type="hidden" name="theme" value="<?= $themeDir ?>" />
+
+    <div class="modal-header">
+        <button type="button" class="close" data-dismiss="popup">&times;</button>
+        <h4 class="modal-title"><?= e(trans('cms::lang.theme.edit_properties_title')) ?>: <?= $themeDir ?></h4>
+    </div>
+
+    <?php if (!$this->fatalError): ?>
+
+        <div class="modal-body">
+            <?= $widget->render() ?>
+        </div>
+        <div class="modal-footer">
+            <button
+                type="submit"
+                class="btn btn-primary">
+                <?= e(trans('cms::lang.theme.save_properties')) ?>
+            </button>
+
+            <button
+                type="button"
+                class="btn btn-default"
+                data-dismiss="popup">
+                <?= e(trans('backend::lang.form.cancel')) ?>
+            </button>
+        </div>
+
+    <?php else: ?>
+
+        <div class="modal-body">
+            <p class="flash-message static error"><?= e(trans($this->fatalError)) ?></p>
+        </div>
+        <div class="modal-footer">
+            <button
+                type="button"
+                class="btn btn-default"
+                data-dismiss="popup">
+                <?= e(trans('backend::lang.form.close')) ?>
+            </button>
+        </div>
+
+    <?php endif ?>
+
+    <script>
+        setTimeout(
+            function(){ $('#themeFieldsForm input.form-control:first').focus() },
+            310
+        )
+    </script>
+
+<?= Form::close() ?>