feat: comprehensive SEO system with keywords and schema markup

- Add 4-locale keyword configurations (SR, EN, DE, FR)
- Create schema generators (Product, Organization, Breadcrumb)
- Add React components for JSON-LD rendering
- Implement caching for keyword performance
- Abstract all SEO logic for maintainability

src/lib/seo/schema/organizationSchema.ts

@@ -0,0 +1,79 @@
+import { OrganizationSchema, WebSiteSchema } from './types';
+import { getBrandKeywords } from '../keywords';
+import { Locale } from '../keywords/types';
+
+interface OrganizationData {
+  logoUrl: string;
+  socialProfiles?: string[];
+  email?: string;
+}
+
+/**
+ * Generate Organization schema (JSON-LD)
+ * Pure function - takes data, returns schema object
+ * 
+ * @param baseUrl - Site base URL
+ * @param locale - Locale code
+ * @param data - Organization data (logo, social links, etc.)
+ * @returns OrganizationSchema object
+ */
+export function generateOrganizationSchema(
+  baseUrl: string,
+  locale: Locale,
+  data: OrganizationData
+): OrganizationSchema {
+  const brandKeywords = getBrandKeywords(locale);
+  
+  const schema: OrganizationSchema = {
+    '@context': 'https://schema.org',
+    '@type': 'Organization',
+    name: brandKeywords.companyName,
+    url: baseUrl,
+    logo: data.logoUrl,
+    description: brandKeywords.tagline,
+  };
+
+  // Add social profiles if provided
+  if (data.socialProfiles && data.socialProfiles.length > 0) {
+    schema.sameAs = data.socialProfiles;
+  }
+
+  // Add contact point if email provided
+  if (data.email) {
+    schema.contactPoint = [{
+      '@type': 'ContactPoint',
+      contactType: 'customer service',
+      email: data.email,
+      availableLanguage: [locale.toUpperCase()],
+    }];
+  }
+
+  return schema;
+}
+
+/**
+ * Generate WebSite schema (JSON-LD)
+ * Includes search action for site search
+ * 
+ * @param baseUrl - Site base URL
+ * @param locale - Locale code
+ * @returns WebSiteSchema object
+ */
+export function generateWebSiteSchema(
+  baseUrl: string,
+  locale: Locale
+): WebSiteSchema {
+  const brandKeywords = getBrandKeywords(locale);
+  
+  return {
+    '@context': 'https://schema.org',
+    '@type': 'WebSite',
+    name: brandKeywords.companyName,
+    url: baseUrl,
+    potentialAction: {
+      '@type': 'SearchAction',
+      target: `${baseUrl}/search?q={search_term_string}`,
+      'query-input': 'required name=search_term_string',
+    },
+  };
+}