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)

components/JsonLd.tsx

@@ -1,53 +1,67 @@
-import { Thing, WithContext } from 'schema-dts';
+import { Thing, WithContext, Graph } from 'schema-dts';
+import { getOrganizationSchema, getLocalBusinessSchema, SITE_URL } from '@/lib/schema';
 
 interface JsonLdProps {
   id?: string;
   data?: WithContext<Thing> | WithContext<Thing>[];
+  disableGlobal?: boolean;
 }
 
-export default function JsonLd({ id, data }: JsonLdProps) {
-  // If data is provided, use it. Otherwise, use the default Organization + WebSite schema.
-  const schemaData = data || [
-    {
-      '@context': 'https://schema.org',
-      '@type': 'Organization',
-      name: 'E-TIB GmbH',
-      url: 'https://e-tib.com',
-      logo: 'https://e-tib.com/assets/logo.png',
-      sameAs: [
-        'https://www.instagram.com/me.and.eloise/',
-      ],
-      description: 'Ihr Partner für Kabelleitungstiefbau, Horizontalspülbohrungen, Planung und Vermessung.',
-      address: {
-        '@type': 'PostalAddress',
-        streetAddress: 'Gewerbestraße 22',
-        addressLocality: 'Guben',
-        postalCode: '03172',
-        addressCountry: 'DE',
-      },
-    },
-    {
+export default function JsonLd({ id, data, disableGlobal = false }: JsonLdProps) {
+  let finalSchema: any;
+
+  if (disableGlobal && data) {
+    // Escape hatch for overriding the global graph
+    finalSchema = data;
+  } else {
+    // Construct the @graph array
+    const graphItems: any[] = [];
+
+    // Always include Organization, WebSite, and LocalBusiness for strong AI SEO presence
+    graphItems.push(getOrganizationSchema());
+    graphItems.push({
       '@context': 'https://schema.org',
       '@type': 'WebSite',
       name: 'E-TIB',
-      url: 'https://e-tib.com',
+      url: SITE_URL,
       potentialAction: {
         '@type': 'SearchAction',
         target: {
           '@type': 'EntryPoint',
-          urlTemplate: 'https://e-tib.com/search?q={search_term_string}',
+          urlTemplate: `${SITE_URL}/search?q={search_term_string}`,
         },
         'query-input': 'required name=search_term_string',
       },
+    });
+    graphItems.push(getLocalBusinessSchema());
+
+    // Append dynamic data from props
+    if (data) {
+      if (Array.isArray(data)) {
+        // Strip out their individual @context if we are pushing to a graph
+        const cleanedData = data.map((d: any) => {
+          const { '@context': _, ...rest } = d;
+          return rest;
+        });
+        graphItems.push(...cleanedData);
+      } else {
+        const { '@context': _, ...rest } = data as any;
+        graphItems.push(rest);
+      }
     }
-  ];
+
+    finalSchema = {
+      '@context': 'https://schema.org',
+      '@graph': graphItems,
+    };
+  }
 
   return (
     <script
       id={id}
       type="application/ld+json"
       dangerouslySetInnerHTML={{
-        __html: JSON.stringify(schemaData),
+        __html: JSON.stringify(finalSchema),
       }}
     />
   );