feat: implement dark mode infrastructure, optimize images, and add SEO structured data

GEMINI.md

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+# GEMINI.md - Portfolio Project Guide
+
+## Project Overview
+Personal portfolio for Dennis Konkol (dk0.dev). A modern, high-performance Next.js 15 application featuring a "liquid" design system, integrated with Directus CMS and n8n for real-time status and content management.
+
+## Tech Stack & Architecture
+- **Framework**: Next.js 15 (App Router), TypeScript, React 19.
+- **UI/UX**: Tailwind CSS 3.4, Framer Motion 12, Three.js (Background).
+- **Backend/Data**: PostgreSQL (Prisma), Redis (Caching), Directus (CMS), n8n (Automation).
+- **i18n**: next-intl (German/English).
+
+## Core Principles for Gemini
+- **Safe Failovers**: Always implement fallbacks for external APIs (Directus, n8n). The site must remain functional even if all external services are down.
+- **Liquid Design**: Use custom `liquid-*` color tokens for consistency.
+- **Performance**: Favor Server Components where possible; use `use client` only for interactivity.
+- **Code Style**: clean, modular, and well-typed. Use functional components and hooks.
+- **i18n first**: Never hardcode user-facing strings; always use `messages/*.json`.
+
+## Common Workflows
+
+### API Route Pattern
+API routes should include:
+- Rate limiting (via `lib/auth.ts`)
+- Timeout protection
+- Proper error handling with logging in development
+- Type-safe responses
+
+### Component Pattern
+- Use Framer Motion for entrance animations.
+- Use `next/image` for all images to ensure optimization.
+- Follow the `glassmorphism` aesthetic: `backdrop-blur-sm`, subtle borders, and gradient backgrounds.
+
+## Development Commands
+- `npm run dev`: Full development environment.
+- `npm run lint`: Run ESLint checks.
+- `npm run test`: Run unit tests.
+- `npm run test:e2e`: Run Playwright E2E tests.
+
+## Environment Variables (Key)
+- `DIRECTUS_URL` & `DIRECTUS_STATIC_TOKEN`: CMS connectivity.
+- `N8N_WEBHOOK_URL` & `N8N_SECRET_TOKEN`: Automation connectivity.
+- `DATABASE_URL`: Prisma connection string.
+
+## Git Workflow
+- Work on the `dev` branch.
+- Use conventional commits: `feat:`, `fix:`, `chore:`, `docs:`, `refactor:`.
+- Push to both GitHub and Gitea remotes.