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/layouts/_hint.php

@@ -0,0 +1,46 @@
+<?php if (empty($hintName) || !$this->isBackendHintHidden($hintName)): ?>
+    <?php
+    $type = !empty($type) ? $type : 'info';
+    $cssClasses = ['callout fade in'];
+    $cssClasses[] = 'callout-'.$type;
+    if (empty($icon)) {
+        $cssClasses[] = 'no-icon';
+    }
+    if (empty($subtitle)) {
+        $cssClasses[] = 'no-subheader';
+    }
+    if (!empty($cssClass)) {
+        $cssClasses[] = $cssClass;
+    }
+    ?>
+
+    <div class="<?= implode(' ', $cssClasses) ?>">
+        <?php if (!empty($hintName)): ?>
+            <button
+                type="button"
+                class="close"
+                data-request="onHideBackendHint"
+                data-request-data="name: '<?= $hintName ?>'"
+                data-dismiss="callout"
+                aria-hidden="true">&times;</button>
+        <?php endif ?>
+        <?php if (!empty($title)): ?>
+            <div class="header">
+                <?php if (!empty($icon)): ?>
+                    <i class="<?= $icon ?>"></i>
+                <?php endif ?>
+                <h3><?= $title ?></h3>
+                <?php if (!empty($subtitle)): ?>
+                    <p><?= $subtitle ?></p>
+                <?php endif ?>
+            </div>
+        <?php endif ?>
+        <div class="content">
+            <?php if ($hintContent): ?>
+                <?= $hintContent ?>
+            <?php else: ?>
+                <?= $this->makePartial($hintPartial, $hintParams) ?>
+            <?php endif ?>
+        </div>
+    </div>
+<?php endif ?>