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/assets/ui/docs/callout.md

@@ -0,0 +1,66 @@
+# Callout
+
+### Callout
+
+Displays a detailed message to the user, also allowing it to be dismissed.
+
+    <div class="callout fade in callout-warning">
+        <button
+            type="button"
+            class="close"
+            data-dismiss="callout"
+            aria-hidden="true">&times;</button>
+        <div class="header">
+            <i class="icon-warning"></i>
+            <h3>Warning warning</h3>
+            <p>My arms are flailing wildly</p>
+        </div>
+        <div class="content">
+            <p>Insert coin(s) to begin play</p>
+        </div>
+    </div>
+
+### No sub-header
+
+Include the `no-subheader` class to omit the sub heading.
+
+    <div class="callout fade in callout-info no-subheader">
+        <div class="header">
+            <i class="icon-info"></i>
+            <h3>Incoming unicorn</h3>
+        </div>
+    </div>
+
+### No icon
+
+Include the `no-icon` class to omit the icon.
+
+    <div class="callout fade in callout-danger no-icon">
+        <div class="header">
+            <h3>There was a hull breach</h3>
+            <ul>
+                <li>Get to the chopper</li>
+            </ul>
+        </div>
+    </div>
+
+### No header
+
+    <div class="callout fade in callout-success">
+        <div class="content">
+            <p>Something good happened</p>
+            <ul>
+                <li>You found a pony</li>
+            </ul>
+        </div>
+    </div>
+
+### Data attributes:
+
+- data-dismiss="callout" - when assigned to an element, the callout hides on click
+
+## JavaScript API
+
+### Events
+
+- close.oc.callout - triggered when the callout is closed