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/system/tests/fixtures/plugins/winter/tester/updates/version.yaml

@@ -0,0 +1,32 @@
+"1.5.1":
+    - Improved signature with the Test::method()
+    - Translation updates.
+"1.5.0": "!!! Another major update to fix several issues"
+"1.4.1": !!! Major update here.
+1.3.2:
+    Added support for Translate plugin.
+    Added some new languages.
+'1.3.1'   :
+    - 'Minor bug fix
+    Please see changelog'
+    - 'fix_database.php'
+"1.3.0" : !!! We've refactored major parts
+    of this plugin. Please see the
+    website for more information.
+1.2.0:
+    - "!!! Security update - see: https://wintercms.com"
+1.1.0  :
+    - "!!! Drop support for blog settings"
+    - drop_blog_settings_table.php
+"1.0.5":
+    - Create blog settings table
+    - Another update message
+    - Yet one more update message
+    - create_blog_settings_table.php
+"1.0.4": "Another fix"
+"1.0.3": Bug fix update that uses no scripts
+1.0.2: Added some stuff
+1.0.1:
+    - Added some upgrade file and some "seeding"
+    - some_upgrade_file.php
+    - some_seeding_file.php