Build portfolio site - Astro + Tailwind, trilingual structure

- Astro 5.x + Tailwind CSS 4.x
- Dark theme with warm orange accent (#f97316)
- i18n routing: /en/, /de/, /es/ (English content complete, DE/ES placeholders)
- Components: Navbar, Hero, Services (4 cards), Projects (4 case studies), About, Contact, Footer
- Fade-in scroll animations
- Mobile-responsive with hamburger menu
- All content from content/*.md integrated
- SEO meta tags, Open Graph tags
- Clean build with no errors

.vscode/extensions.json

@@ -0,0 +1,4 @@
+{
+  "recommendations": ["astro-build.astro-vscode"],
+  "unwantedRecommendations": []
+}