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

themes/vivespos/pages/blog.htm

@@ -0,0 +1,39 @@
+title = "Blog — VivesPOS"
+meta_title = "Blog — VivesPOS"
+meta_description = "Consejos, guias y noticias sobre puntos de venta, retail en Mexico y VivesPOS."
+url = "/blog"
+layout = "default"
+
+[blogPosts]
+postsPerPage = 9
+postPage = "blog/post"
+sortOrder = "published_at desc"
+noPostsMessage = "Pronto publicaremos articulos. Vuelve pronto!"
+==
+<section class="py-5 py-md-6">
+  <div class="container">
+    <div class="text-center mb-5">
+      <p class="eyebrow eyebrow-blue mb-2">Blog VivesPOS</p>
+      <h1 class="display-5 fw-bold mb-2">Consejos para tu negocio</h1>
+      <p class="lead text-muted">Guias sobre retail, puntos de venta y tecnologia para Mexico.</p>
+    </div>
+    <div class="row g-4">
+      {% for post in posts %}
+      <div class="col-md-6 col-lg-4">
+        <div class="card border-0 shadow-sm h-100 rounded-4 overflow-hidden">
+          <div class="card-body p-4">
+            <p class="text-muted small mb-2">{{ post.published_at|date('d M Y') }}</p>
+            <h3 class="h5 fw-bold mb-2">{{ post.title }}</h3>
+            <p class="text-muted small mb-3">{{ post.summary|default(post.content|striptags|slice(0, 120)) }}...</p>
+            <a href="{{ '/blog/post'|page({ slug: post.slug }) }}" class="text-brand text-decoration-none fw-semibold small">Leer mas &rarr;</a>
+          </div>
+        </div>
+      </div>
+      {% else %}
+      <div class="col-12 text-center py-5">
+        <p class="text-muted">{{ noPostsMessage }}</p>
+      </div>
+      {% endfor %}
+    </div>
+  </div>
+</section>