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/treelist.less

@@ -0,0 +1,93 @@
+//
+// Tree List
+// --------------------------------------------------
+
+.control-treelist {
+    ol {
+        padding: 0;
+        margin: 0;
+        list-style: none;
+
+        ol {
+            margin: 0;
+            margin-left: 15px;
+            padding-left: 15px;
+            border-left: 1px solid #dbdee0;
+        }
+    }
+
+    > ol > li > div.record:before {
+        display: none;
+    }
+
+    li {
+        margin: 0;
+        padding: 0;
+        > div.record {
+            margin: 0;
+            font-size: 12px;
+            margin-bottom: 5px;
+            position: relative;
+            display: block;
+
+            &:before {
+                color: #bdc3c7;
+                .icon(@circle);
+                font-size: 6px;
+                position: absolute;
+                left: -18px; 
+                top: 11px;
+            }
+
+            > a.move {
+                display: inline-block;
+                padding: 7px 0 7px 10px;
+                text-decoration: none;
+                color: #bdc3c7;
+                &:hover {
+                    color: @color-list-hover-bg;
+                }
+                &:before { .icon(@bars); }
+            }
+            > span {
+                color: @color-list-text;
+                display: inline-block;
+                padding: 7px 15px 7px 5px;
+            }
+        }
+
+        &.dragged {
+            position: absolute;
+            z-index: 2000;
+            width: auto !important; // Prevent browser scrollbars
+            height: auto !important;
+            > div.record {
+                .opacity(.5);
+                background: @color-list-hover-bg !important;
+                > a.move:before, > span { color: white; }
+
+                &:before {
+                    display: none;
+                }
+            }
+        }
+
+        &.placeholder {
+            display: inline-block;
+            position: relative;
+            background: @color-list-hover-bg !important;
+            height: 25px;
+            margin-bottom: 5px;
+            &:before {
+                display: block;
+                position: absolute;
+                .icon(@chevron-left);
+                color: #d35714;
+                left: -10px;
+                top: 8px;
+                z-index: 2000;
+            }
+        }
+
+    }
+}