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/fileupload/assets/less/fileupload.less

@@ -0,0 +1,15 @@
+@import "../../../../assets/less/core/boot.less";
+
+@fileupload-progress-bar-height: 5px;
+@fileupload-progress-bar-color:  #fff;
+@fileupload-progress-bar-bg:     #f5f5f5;
+@fileupload-inactive-icon:       #808b93;
+@fileupload-object-active-bg:    #4da7e8;
+@fileupload-list-accent-bg:      #f5f5f5;
+@fileupload-list-border-color:   #eeeeee;
+
+@import "fileupload.base.less";
+@import "fileupload.imagemulti.less";
+@import "fileupload.imagesingle.less";
+@import "fileupload.filemulti.less";
+@import "fileupload.filesingle.less";