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/assets/less/layout/footer.less

@@ -0,0 +1,32 @@
+@footer-zindex: 100;
+@footer-height: 60;
+
+#layout-footer {
+    width: 100%;
+    z-index: @footer-zindex;
+    height: @footer-height + 0px;
+    position: fixed;
+    bottom: 0;
+    color: @color-footer-text;
+    background-color: @color-footer;
+    border-top: 1px solid @color-footer-border;
+
+    .brand, .tagline {
+        margin: 10px;
+        height: (@footer-height - 20) + 0px;
+        line-height: (@footer-height - 20) + 0px;
+    }
+
+    .brand {
+        float: left;
+        font-size: 16px;
+        .logo { margin: 0 10px; }
+        .name { }
+    }
+
+    .tagline {
+        float: right;
+        p { color: lighten(@color-footer-text, 20%); }
+    }
+}
+