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/contacto.htm

@@ -0,0 +1,39 @@
+title = "Contacto — VivesPOS"
+meta_title = "Contacto — VivesPOS"
+meta_description = "Contactanos por WhatsApp o formulario. Respuesta en menos de 2 horas habiles."
+url = "/contacto"
+layout = "default"
+==
+<section class="py-5 py-md-6">
+  <div class="container">
+    <div class="row justify-content-center">
+      <div class="col-lg-8">
+        <div class="text-center mb-5">
+          <p class="eyebrow eyebrow-blue mb-2">Contacto</p>
+          <h1 class="display-5 fw-bold mb-2">Habla con nosotros</h1>
+          <p class="lead text-muted">Estamos aqui para ayudarte. Sin compromiso, sin spam.</p>
+        </div>
+        <div class="card border-0 shadow-sm rounded-4 p-4">
+          <div class="row g-4">
+            <div class="col-md-6">
+              <h3 class="h5 fw-bold mb-3">WhatsApp directo</h3>
+              <p class="text-muted small mb-3">La forma mas rapida de contactarnos. Te respondemos en minutos durante horario habil.</p>
+              <a href="https://wa.me/523317025248?text=Hola%2C%20quiero%20mas%20info%20de%20VivesPOS" class="btn btn-brand-cta w-100 mb-3" target="_blank" rel="noopener">
+                <i class="bi-whatsapp me-2"></i>+52 33 1702 5248
+              </a>
+              <p class="text-muted small mb-0">Horario: L-V 9:00-18:00 CST</p>
+            </div>
+            <div class="col-md-6">
+              <h3 class="h5 fw-bold mb-3">Soporte para clientes</h3>
+              <p class="text-muted small mb-3">Ya eres cliente de VivesPOS? Abre un ticket y te ayudamos.</p>
+              <a href="https://wa.me/523317025248?text=Soy%20cliente%20de%20VivesPOS%20y%20necesito%20soporte" class="btn btn-outline-secondary w-100 mb-3" target="_blank" rel="noopener">
+                <i class="bi-life-preserver me-2"></i>Abrir ticket de soporte
+              </a>
+              <p class="text-muted small mb-0">Respuesta max 6h habiles (Premium)</p>
+            </div>
+          </div>
+        </div>
+      </div>
+    </div>
+  </div>
+</section>