feat(seo): implement AI SEO and structured data schema

- Add robust JSON-LD schema generators (LocalBusiness, FAQ, Service, Event)
- Refactor JsonLd component to use @graph pattern for merging global/local schemas
- Create FaqBlock component with automatic FAQPage schema injection
- Inject specific JSON-LD schemas into mdx pages (home, kompetenzen, messen)
- Add structured AI SEO content (hard facts, stats, clear definitions)

lib/schema.ts

@@ -34,3 +34,85 @@ export const getBreadcrumbSchema = (items: { name: string; item: string }[]) =>
     item: item.item.startsWith('http') ? item.item : `${SITE_URL}${item.item}`,
   })),
 });
+
+export const getLocalBusinessSchema = () => ({
+  '@context': 'https://schema.org' as const,
+  '@type': 'LocalBusiness' as const,
+  name: 'E-TIB GmbH',
+  url: SITE_URL,
+  logo: LOGO_URL,
+  image: LOGO_URL,
+  description: 'Ihr Partner für Kabelleitungstiefbau, Horizontalspülbohrungen, Planung und Vermessung in Guben und überregional.',
+  telephone: '+49-15207230518',
+  email: 'd.joseph@e-tib.com',
+  address: {
+    '@type': 'PostalAddress' as const,
+    streetAddress: 'Gewerbestraße 22',
+    addressLocality: 'Guben',
+    postalCode: '03172',
+    addressCountry: 'DE',
+  },
+  geo: {
+    '@type': 'GeoCoordinates' as const,
+    latitude: 51.9547, // Approx coordinates for Guben area
+    longitude: 14.7175,
+  },
+  openingHoursSpecification: [
+    {
+      '@type': 'OpeningHoursSpecification' as const,
+      dayOfWeek: ['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday'],
+      opens: '08:00',
+      closes: '17:00',
+    },
+  ],
+  sameAs: ['https://www.instagram.com/me.and.eloise/'],
+});
+
+export const getFAQSchema = (questions: { question: string; answer: string }[]) => ({
+  '@context': 'https://schema.org' as const,
+  '@type': 'FAQPage' as const,
+  mainEntity: questions.map((q) => ({
+    '@type': 'Question' as const,
+    name: q.question,
+    acceptedAnswer: {
+      '@type': 'Answer' as const,
+      text: q.answer,
+    },
+  })),
+});
+
+export const getServiceSchema = (serviceName: string, description: string, image?: string) => ({
+  '@context': 'https://schema.org' as const,
+  '@type': 'Service' as const,
+  name: serviceName,
+  description: description,
+  provider: {
+    '@type': 'Organization' as const,
+    name: 'E-TIB GmbH',
+  },
+  ...(image && { image }),
+});
+
+export const getEventSchema = (event: { name: string; startDate: string; endDate?: string; locationName: string; locationAddress?: string; url?: string }) => ({
+  '@context': 'https://schema.org' as const,
+  '@type': 'Event' as const,
+  name: event.name,
+  startDate: event.startDate,
+  ...(event.endDate && { endDate: event.endDate }),
+  location: {
+    '@type': 'Place' as const,
+    name: event.locationName,
+    ...(event.locationAddress && {
+      address: {
+        '@type': 'PostalAddress' as const,
+        streetAddress: event.locationAddress,
+      },
+    }),
+  },
+  organizer: {
+    '@type': 'Organization' as const,
+    name: 'E-TIB GmbH',
+    url: SITE_URL,
+  },
+  ...(event.url && { url: event.url }),
+});