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/controls/common.less

@@ -0,0 +1,66 @@
+//
+// Common control styles
+// --------------------------------------------------
+
+//
+// The scroll panel can host a scrollbar control. It has a right border that covers
+// the scrollbar to satisfy the design requirements.
+//
+.control-scrollpanel {
+    position: relative;
+    background: @color-panel-light;
+
+    .control-scrollbar {
+        &.vertical > .scrollbar-scrollbar {right: 0;}
+    }
+}
+
+.tooltip {
+    .tooltip-inner {
+        text-align: left;
+        padding: 5px 8px;
+    }
+
+    &.in {
+        .opacity(1);
+    }
+}
+
+//
+// Logos
+//
+
+.wn-logo-white, .oc-logo-white {
+    background-image: url(../images/winter-logo-white.svg);
+    background-position: 50% 50%;
+    background-repeat: no-repeat;
+    background-size: contain;
+}
+
+.wn-logo, .oc-logo {
+    background-image: url(../images/winter-logo.svg);
+    background-position: 50% 50%;
+    background-repeat: no-repeat;
+    background-size: contain;
+}
+
+.layout.control-tabs.wn-logo-transparent:not(.has-tabs), .layout.control-tabs.oc-logo-transparent:not(.has-tabs),
+.flex-layout-column.wn-logo-transparent:not(.has-tabs), .flex-layout-column.oc-logo-transparent:not(.has-tabs),
+.layout-cell.wn-logo-transparent, .layout-cell.oc-logo-transparent {
+    background-size: 50% auto;
+    background-repeat: no-repeat;
+    background-image: url(../images/winter-logo.svg);
+    background-position: 50% 50%;
+    position: relative;
+
+    &:after {
+        content: '';
+        display: table-cell;
+        position: absolute;
+        left: 0;
+        top: 0;
+        height: 100%;
+        width: 100%;
+        background: rgba(249,249,249,0.7);
+    }
+}