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/record-navigation.less

@@ -0,0 +1,69 @@
+//
+// Record navigation
+//
+// Previous/next navigation shown in the breadcrumb row of a form, letting the
+// user step through the sibling records of the controller's list (respecting
+// its active filters, search and sorting). Rendered by the FormController
+// behavior via formcontroller/partials/_record_navigation.php.
+// ========================================================================
+
+.control-breadcrumb {
+    position: relative;
+}
+
+.form-record-nav {
+    position: absolute;
+    top: 0;
+    bottom: 0;
+    right: 20px;
+    display: flex;
+    align-items: center;
+    gap: 9px;
+    font-size: 12px;
+
+    .form-record-nav-position {
+        color: #5a6b7b;
+        font-weight: 600;
+        letter-spacing: .3px;
+        white-space: nowrap;
+    }
+
+    .form-record-nav-group {
+        display: inline-flex;
+        align-items: center;
+        background: rgba(255, 255, 255, .55);
+        border: 1px solid rgba(0, 0, 0, .09);
+        border-radius: 6px;
+        overflow: hidden;
+        box-shadow: 0 1px 1px rgba(0, 0, 0, .03);
+    }
+
+    .form-record-nav-btn {
+        display: flex;
+        align-items: center;
+        justify-content: center;
+        width: 28px;
+        height: 24px;
+        color: #5a6b7b;
+        text-decoration: none;
+        transition: background-color .12s ease, color .12s ease;
+
+        & + .form-record-nav-btn {
+            border-left: 1px solid rgba(0, 0, 0, .09);
+        }
+
+        &:not(.is-disabled):hover {
+            background-color: #fff;
+            color: #1f2d3d;
+        }
+
+        &.is-disabled {
+            color: #b6bfc7;
+            cursor: default;
+        }
+
+        svg {
+            display: block;
+        }
+    }
+}