Migrate from Vite to Next.js 15 with SSR

- Replace Vite + React Router with Next.js 15 App Router
- Implement i18n with next-intl (URL-based: /de, /en, /sr)
- Add SSR/SSG for all pages (48 static pages generated)
- Setup Supabase SSR client for auth
- Migrate all pages: Home, About, Portfolio, Blog, Contact, Login, Dashboard, Imprint, Privacy, Terms
- Add Docker support with standalone output
- Replace i18next with next-intl JSON translations
- Use next/image for optimized images

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

package.json

@@ -1,81 +1,51 @@
 {
-  "name": "Portfolio",
+  "name": "portfolio",
   "private": true,
-  "version": "0.0.0",
-  "type": "module",
+  "version": "1.0.0",
   "scripts": {
-    "dev": "vite",
-    "build": "npm run generate-sitemap && vite build",
+    "dev": "next dev",
+    "build": "next build",
+    "start": "next start",
+    "lint": "next lint",
     "build:images": "node scripts/optimize-images.js",
-    "lint": "eslint .",
-    "preview": "vite preview",
     "test": "vitest",
-    "test:coverage": "vitest run --coverage",
-    "generate-sitemap": "node scripts/generate-sitemap.js"
+    "test:coverage": "vitest run --coverage"
   },
   "dependencies": {
     "@mdx-js/loader": "^3.1.0",
     "@mdx-js/mdx": "^3.1.0",
     "@mdx-js/react": "^3.1.0",
-    "@mdx-js/rollup": "^3.1.0",
-    "@rollup/plugin-babel": "^6.0.4",
+    "@next/mdx": "^15.1.0",
+    "@supabase/ssr": "^0.8.0",
     "@supabase/supabase-js": "^2.39.7",
-    "@types/mdx": "^2.0.13",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
     "framer-motion": "^11.18.2",
     "gray-matter": "^4.0.3",
-    "i18next": "^23.10.1",
-    "i18next-browser-languagedetector": "^7.2.0",
-    "lucide-react": "^0.263.1",
+    "lucide-react": "^0.475.0",
+    "next": "^15.1.0",
+    "next-intl": "^3.26.0",
     "next-mdx-remote": "^5.0.0",
-    "react": "^18.3.1",
-    "react-cookie-consent": "^9.0.0",
-    "react-dom": "^18.3.1",
-    "react-ga4": "^2.1.0",
-    "react-helmet-async": "^2.0.4",
-    "react-i18next": "^14.1.0",
+    "react": "^19.0.0",
+    "react-dom": "^19.0.0",
     "react-intersection-observer": "^9.8.1",
-    "react-router-dom": "^6.29.0",
-    "react-swipeable": "^7.0.2",
-    "reading-time": "^1.5.0",
-    "remark-frontmatter": "^5.0.0",
-    "remark-mdx-frontmatter": "^5.0.0",
     "tailwind-merge": "^3.0.1",
     "tailwindcss-animate": "^1.0.7",
-    "uuid": "^9.0.1",
-    "web-vitals": "^5.1.0",
-    "workbox-cacheable-response": "^7.0.0",
-    "workbox-core": "^7.0.0",
-    "workbox-expiration": "^7.0.0",
-    "workbox-precaching": "^7.0.0",
-    "workbox-routing": "^7.0.0",
-    "workbox-strategies": "^7.0.0"
+    "web-vitals": "^5.1.0"
   },
   "devDependencies": {
-    "@eslint/js": "^9.9.1",
     "@tailwindcss/forms": "^0.5.7",
-    "@testing-library/jest-dom": "^6.4.2",
-    "@testing-library/react": "^14.2.1",
-    "@testing-library/user-event": "^14.5.2",
-    "@types/react": "^18.3.5",
-    "@types/react-dom": "^18.3.0",
-    "@types/uuid": "^9.0.8",
-    "@vitejs/plugin-react": "^4.3.1",
-    "@vitest/coverage-v8": "^1.3.1",
+    "@types/mdx": "^2.0.13",
+    "@types/node": "^22.0.0",
+    "@types/react": "^19.0.0",
+    "@types/react-dom": "^19.0.0",
     "autoprefixer": "^10.4.18",
     "eslint": "^9.9.1",
-    "eslint-plugin-react-hooks": "^5.1.0-rc.0",
-    "eslint-plugin-react-refresh": "^0.4.11",
-    "globals": "^15.9.0",
-    "jsdom": "^24.0.0",
+    "eslint-config-next": "^15.1.0",
     "postcss": "^8.4.35",
     "sharp": "^0.34.3",
     "tailwindcss": "^3.4.1",
     "typescript": "^5.5.3",
-    "typescript-eslint": "^8.3.0",
-    "vite": "^5.4.2",
-    "vite-plugin-pwa": "^0.19.8",
     "vitest": "^1.3.1"
   }
 }