auto-claude: subtask-3-1 - Audit existing JsonLd components and enhance struc

Enhanced JSON-LD structured data coverage with the following improvements:

## PersonJsonLd Enhancements:
- Added hasOccupation with skills and occupationLocation
- Added knowsLanguage (German, English, Serbian)
- Added worksFor reference to business
- Added nationality for geo-targeting
- Enhanced knowsAbout with Claude AI, GPT-4, LangChain
- Upgraded image to ImageObject with dimensions

## New Components:
- ContactPageJsonLd: Contact page with ContactPoint entity
- CollectionPageJsonLd: Portfolio page with ItemList for projects
- ItemListJsonLd: Generic list schema for any items

## WebSiteJsonLd Enhancement:
- Added SearchAction for sitelinks search box

## Page Updates:
- Contact page now uses ContactPageJsonLd
- Portfolio page now uses CollectionPageJsonLd and BreadcrumbJsonLd

All schemas use @id cross-references for proper entity linking.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/app/[locale]/contact/page.tsx

@@ -2,7 +2,7 @@ import { setRequestLocale } from 'next-intl/server';
 import type { Metadata } from 'next';
 import { getTranslations } from 'next-intl/server';
 import { ContactForm } from '@/components/contact';
-import { BreadcrumbJsonLd, WebPageJsonLd } from '@/components/seo';
+import { BreadcrumbJsonLd, WebPageJsonLd, ContactPageJsonLd } from '@/components/seo';
 import { type Locale } from '@/i18n/config';
 
 type Props = {
@@ -80,6 +80,7 @@ export default async function ContactPage({ params }: Props) {
         url={`/${locale}/contact`}
         locale={locale as Locale}
       />
+      <ContactPageJsonLd locale={locale as Locale} />
       <ContactForm />
     </>
   );

src/app/[locale]/portfolio/page.tsx

@@ -2,6 +2,8 @@ import { setRequestLocale } from 'next-intl/server';
 import type { Metadata } from 'next';
 import { getTranslations } from 'next-intl/server';
 import { PortfolioGrid } from '@/components/portfolio';
+import { BreadcrumbJsonLd, CollectionPageJsonLd } from '@/components/seo';
+import { type Locale } from '@/i18n/config';
 
 type Props = {
   params: Promise<{ locale: string }>;
@@ -165,8 +167,25 @@ export default async function PortfolioPage({ params }: Props) {
 
   const t = await getTranslations('portfolio');
 
+  const breadcrumbItems = [
+    { name: locale === 'de' ? 'Start' : locale === 'sr' ? 'Početna' : 'Home', url: `/${locale}` },
+    { name: 'Portfolio', url: `/${locale}/portfolio` },
+  ];
+
+  // Transform projects for JSON-LD schema
+  const portfolioProjects = projects.map((project) => ({
+    name: project.title,
+    description: project.description,
+    url: `/${locale}/portfolio/${project.slug}`,
+    dateCreated: project.date,
+    technologies: project.technologies,
+  }));
+
   return (
     <div className="relative min-h-screen">
+      <BreadcrumbJsonLd items={breadcrumbItems} locale={locale as Locale} />
+      <CollectionPageJsonLd locale={locale as Locale} projects={portfolioProjects} />
+
       <section className="py-24">
         <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
           <div className="text-center mb-16">