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/formwidgets/mediafinder/assets/less/mediafinder.filesingle.less

@@ -0,0 +1,90 @@
+
+.field-mediafinder.style-file-single {
+    background-color: @color-form-field-bg;
+    border: 1px solid @color-form-field-border;
+    overflow: hidden;
+    position: relative;
+    padding-right: 30px;
+    border-radius: 3px;
+    .box-shadow(@input-box-shadow);
+
+    .find-button {
+        .finder-vertical-align();
+        background: transparent;
+        right: -2px;
+
+        color: lighten(@color-form-field-recordfinder-btn, 15%);
+
+        i {
+            font-size: 14px;
+        }
+
+        &:hover {
+            color: @color-form-field-recordfinder-btn;
+        }
+    }
+
+    .find-empty-message {
+        padding: 8px 0 8px 11px;
+        font-size: 14px;
+    }
+
+    .find-object {
+        display: none;
+        width: 100%;
+        padding: 7px 0 9px 0;
+
+        .icon-container {
+            position: absolute;
+            top: 0;
+            left: 0;
+            width: 15px;
+            padding: 0 5px;
+            margin: 8px 0 0 7px;
+            text-align: center;
+
+            i {
+                line-height: 150%;
+                font-size: 15px;
+            }
+        }
+
+        .info {
+            margin-left: 34px;
+            white-space: nowrap;
+            overflow: hidden;
+            text-overflow: ellipsis;
+
+            h4 {
+                display: inline;
+                margin: 0;
+                padding: 0;
+                font-size: 13px;
+                line-height: 150%;
+                color: #666666;
+            }
+        }
+
+        .meta {
+            .finder-vertical-align();
+            right: 0;
+            .find-remove-button {
+                position: absolute;
+                top: 50%;
+                right: 0;
+                height: 20px;
+                margin-top: -11px;
+                margin-right: 10px;
+            }
+        }
+    }
+
+    &.is-populated {
+        .find-empty-message {
+            display: none;
+        }
+        .find-object {
+            display: block;
+        }
+    }
+}