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)

content/de/messen.mdx

@@ -27,3 +27,72 @@ layout: "fullBleed"
 </div>
 
 <CallToAction />
+
+<JsonLd data={[
+  {
+    "@type": "Event",
+    "name": "Intersolar München",
+    "startDate": "2026-06-19",
+    "endDate": "2026-06-21",
+    "eventAttendanceMode": "https://schema.org/OfflineEventAttendanceMode",
+    "eventStatus": "https://schema.org/EventScheduled",
+    "location": {
+      "@type": "Place",
+      "name": "Messe München",
+      "address": {
+        "@type": "PostalAddress",
+        "addressLocality": "München",
+        "addressCountry": "DE"
+      }
+    },
+    "organizer": {
+      "@type": "Organization",
+      "name": "E-TIB GmbH",
+      "url": "https://e-tib.com"
+    }
+  },
+  {
+    "@type": "Event",
+    "name": "Windenergietage Linstow",
+    "startDate": "2026-11-04",
+    "endDate": "2026-11-06",
+    "eventAttendanceMode": "https://schema.org/OfflineEventAttendanceMode",
+    "eventStatus": "https://schema.org/EventScheduled",
+    "location": {
+      "@type": "Place",
+      "name": "Van der Valk Resort Linstow",
+      "address": {
+        "@type": "PostalAddress",
+        "addressLocality": "Linstow",
+        "addressCountry": "DE"
+      }
+    },
+    "organizer": {
+      "@type": "Organization",
+      "name": "E-TIB GmbH",
+      "url": "https://e-tib.com"
+    }
+  },
+  {
+    "@type": "Event",
+    "name": "Kabelwerkstatt Wiesbaden",
+    "startDate": "2026-12-02",
+    "endDate": "2026-12-03",
+    "eventAttendanceMode": "https://schema.org/OfflineEventAttendanceMode",
+    "eventStatus": "https://schema.org/EventScheduled",
+    "location": {
+      "@type": "Place",
+      "name": "RheinMain CongressCenter",
+      "address": {
+        "@type": "PostalAddress",
+        "addressLocality": "Wiesbaden",
+        "addressCountry": "DE"
+      }
+    },
+    "organizer": {
+      "@type": "Organization",
+      "name": "E-TIB GmbH",
+      "url": "https://e-tib.com"
+    }
+  }
+]} />