feat(seo): add local business address and area served signals

- add PostalAddress and areaServed (Malaga city + province) to the
  sitewide JSON-LD structured data
- show the same address as visible NAP text in the footer and on the
  contact page, matching the schema exactly
- add address and area served to llms.txt for AEO/AI-crawler readability

src/layouts/MainLayout.astro

@@ -42,6 +42,26 @@ const baseStructuredData = {
     'Servicio de catering para bodas, eventos corporativos y reuniones familiares con enfoque premium.',
   telephone: '+34 678 17 15 13',
   serviceType: ['Bodas', 'Eventos corporativos', 'Reuniones familiares'],
+  // Verified business address (owner-confirmed). Geo coordinates not confirmed — left out.
+  address: {
+    '@type': 'PostalAddress',
+    streetAddress: 'Calle Camino Vivero, 6',
+    postalCode: '29014',
+    addressLocality: 'Málaga',
+    addressRegion: 'Málaga',
+    addressCountry: 'ES',
+  },
+  // Kept conservative to the confirmed service area: city + province of Málaga.
+  areaServed: [
+    {
+      '@type': 'City',
+      name: 'Málaga',
+    },
+    {
+      '@type': 'AdministrativeArea',
+      name: 'Provincia de Málaga',
+    },
+  ],
   contactPoint: {
     '@type': 'ContactPoint',
     contactType: 'customer service',