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/views/mail/partial-footer.php

@@ -0,0 +1,16 @@
+name = "Footer"
+==
+-------------------
+{{ body|trim }}
+==
+<tr>
+    <td>
+        <table class="footer" align="center" width="570" cellpadding="0" cellspacing="0">
+            <tr>
+                <td class="content-cell" align="center">
+                    {{ body|md_safe }}
+                </td>
+            </tr>
+        </table>
+    </td>
+</tr>