fix(seo): correct canonical domain to www.mnqeventos.es

mnqcatering.com was never actually registered (WHOIS: no match, no DNS
records) -- it was an intended rename that never happened. The real,
live, registered production domain is www.mnqeventos.es. Every
canonical/OG/schema/sitemap/robots reference and the host-redirect
middleware pointed at the wrong, non-resolving domain; left as-is, the
middleware would have 301'd every real visitor away to a dead host.

Also fixes two schema.org validity issues found during audit:
- '@type': 'CateringService' is not a real schema.org type -- corrected
  to 'CateringBusiness' (LocalBusiness/FoodEstablishment subtype)
- 'serviceType' is a Service property, not valid on LocalBusiness --
  restructured as makesOffer -> Offer -> itemOffered Service entities
- telephone normalized to E.164 in the schema block

src/components/SiteFooter.astro

@@ -19,7 +19,7 @@ const whatsappAriaLabel = 'Contactar con MNQ por WhatsApp';
         <p>© 2025 MNQ Catering y Evento. Excelencia culinaria para los momentos más importantes de su vida.</p>
         <div style="display:flex;flex-direction:column;gap:0.35rem;margin-top:var(--space-4);">
           <a href="tel:+34678171513" class="footer-link" style="width:fit-content;">+34 678 17 15 13</a>
-          <a href="https://www.mnqcatering.com" class="footer-link" style="width:fit-content;">www.mnqcatering.com</a>
+          <a href="https://www.mnqeventos.es" class="footer-link" style="width:fit-content;">www.mnqeventos.es</a>
           <p class="text-body-sm" style="width:fit-content;">Calle Camino Vivero, 6, 29014, Málaga</p>
         </div>
       </div>