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

public/llms.txt

@@ -1,6 +1,6 @@
 MNQ Catering y Evento
 
-- Canonical domain: https://www.mnqcatering.com
+- Canonical domain: https://www.mnqeventos.es
 - Business type: Premium catering service
 - Address: Calle Camino Vivero, 6, 29014, Málaga, España
 - Area served: Málaga (city) and Provincia de Málaga

public/robots.txt

@@ -1,4 +1,4 @@
 User-agent: *
 Allow: /
 
-Sitemap: https://www.mnqcatering.com/sitemap-index.xml
+Sitemap: https://www.mnqeventos.es/sitemap-index.xml