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/system/controllers/updates/_theme_form.php

@@ -0,0 +1,47 @@
+<?= Form::open(['id' => 'themeForm']) ?>
+    <div class="modal-header">
+        <button type="button" class="close" data-dismiss="popup">&times;</button>
+        <h4 class="modal-title"><?= e(trans('system::lang.install.theme_label')) ?></h4>
+    </div>
+    <div class="modal-body">
+
+        <?php if ($this->fatalError): ?>
+            <p class="flash-message static error"><?= e($fatalError) ?></p>
+        <?php endif ?>
+
+        <div class="form-group">
+            <label for="themeCode"><?= e(trans('system::lang.theme.name.label')) ?></label>
+            <input
+                name="code"
+                type="text"
+                class="form-control"
+                id="themeCode"
+                value="<?= e(post('code')) ?>" />
+            <p class="help-block"><?= e(trans('system::lang.theme.name.help')) ?></p>
+        </div>
+
+    </div>
+
+    <div class="modal-footer">
+        <button
+            type="submit"
+            class="btn btn-primary"
+            data-dismiss="popup"
+            data-control="popup"
+            data-handler="onInstallTheme">
+            <?= e(trans('system::lang.install.theme_label')) ?>
+        </button>
+        <button
+            type="button"
+            class="btn btn-default"
+            data-dismiss="popup">
+            <?= e(trans('backend::lang.form.cancel')) ?>
+        </button>
+    </div>
+    <script>
+        setTimeout(
+            function(){ $('#themeCode').select() },
+            310
+        )
+    </script>
+<?= Form::close() ?>