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/controllers/mailtemplates/config_form.yaml

@@ -0,0 +1,16 @@
+# ===================================
+#  Form Behavior Config
+# ===================================
+
+name: system::lang.mail_templates.template
+form: ~/modules/system/models/mailtemplate/fields.yaml
+modelClass: System\Models\MailTemplate
+defaultRedirect: system/mailtemplates
+
+create:
+    redirect: system/mailtemplates/update/:id
+    redirectClose: system/mailtemplates
+
+update:
+    redirect: system/mailtemplates
+    redirectClose: system/mailtemplates