feat: secure and document book reviews system

Added rate limiting to APIs, cleaned up docs, implemented fallback logic for reviews without text, and added comprehensive n8n guide.

TODO.md

@@ -1,51 +1,28 @@
-# TODO - Portfolio Roadmap
+# Portfolio Roadmap
 
-## Book Reviews (Neu)
+## Completed ✅
 
-- [ ] **Directus Collection erstellen**: `book_reviews` mit Feldern:
-  - `status` (draft/published)
-  - `book_title` (String)
-  - `book_author` (String)
-  - `book_image` (String, URL zum Cover)
-  - `rating` (Integer, 1-5)
-  - `hardcover_id` (String, optional)
-  - `finished_at` (Datetime, optional)
-  - Translations: `review` (Text) + `languages_code` (FK)
-- [ ] **n8n Workflow**: Automatisch Directus-Entwurf erstellen wenn Buch auf Hardcover als "gelesen" markiert wird
-- [ ] **Hardcover GraphQL Query** für gelesene Bücher: `status_id: {_eq: 3}` (Read)
-- [ ] **Erste Testdaten**: 2-3 gelesene Bücher mit Rating + Kommentar in Directus anlegen
+- [x] **Dark Mode Support**: `next-themes` integration, `ThemeToggle` component, and dark mode styles.
+- [x] **Performance**: Replaced `<img>` with Next.js `<Image>` for optimization.
+- [x] **SEO**: Added JSON-LD Structured Data for projects.
+- [x] **Security**: Rate limiting added to `book-reviews`, `hobbies`, and `tech-stack` APIs.
+- [x] **Book Reviews**:
+  - `ReadBooks` component updated to handle optional ratings/reviews.
+  - `CurrentlyReading` component verified.
+  - Automation guide created (`docs/N8N_HARDCOVER_GUIDE.md`).
+- [x] **Testing**: Added tests for `book-reviews`, `hobbies`, `tech-stack`, `CurrentlyReading`, and `ThemeToggle`.
 
-## Directus CMS
+## Next Steps
 
-- [ ] Messages Collection: `messages` mit key + translations (ersetzt `messages/*.json`)
-- [ ] Projects vollständig zu Directus migrieren (`node scripts/migrate-projects-to-directus.js`)
-- [ ] Directus Webhooks einrichten: On-Demand ISR Revalidation bei Content-Änderungen
-- [ ] Directus Roles: Public Read Token, Admin Write
+### Directus CMS
+- [ ] **Messages Collection**: Create `messages` collection in Directus for dynamic i18n (currently using `messages/*.json`).
+- [ ] **Projects Migration**: Finish migrating projects content to Directus (script exists: `scripts/migrate-projects-to-directus.js`).
+- [ ] **Webhooks**: Configure Directus webhooks for On-Demand ISR Revalidation.
 
-## n8n Integrationen
+### Features
+- [ ] **Blog/Articles**: Design and implement the blog section.
+- [ ] **Project Detail Gallery**: Add a lightbox/gallery for project screenshots.
 
-- [ ] Hardcover "Read Books" Webhook: Gelesene Bücher automatisch in Directus importieren
-- [ ] Spotify Now Playing verbessern: Album-Art Caching
-- [ ] Discord Rich Presence: Gaming-Status automatisch aktualisieren
-
-## Frontend
-
-- [ ] Dark Mode Support (Theme Toggle)
-- [ ] Blog/Artikel Sektion (Directus-basiert)
-- [ ] Projekt-Detail Seite: Bildergalerie/Lightbox
-- [ ] Performance: Bilder auf Next.js `<Image>` umstellen (statt `<img>`)
-- [ ] SEO: Structured Data (JSON-LD) für Projekte
-
-## Testing & Qualität
-
-- [ ] Jest Tests für neue API-Routes (`book-reviews`, `hobbies`, `tech-stack`)
-- [ ] Playwright E2E: Book Reviews Sektion testen
-- [ ] Lighthouse Score > 95 auf allen Seiten sicherstellen
-- [ ] Accessibility Audit (WCAG 2.1 AA)
-
-## DevOps
-
-- [ ] Staging Environment aufräumen und dokumentieren
-- [ ] GitHub Actions Migration (von Gitea Actions)
-- [ ] Docker Image Size optimieren (Multi-Stage Build prüfen)
-- [ ] Health Check Endpoint erweitern: Directus + n8n Connectivity
+### DevOps
+- [ ] **GitHub Actions**: Migrate CI/CD fully to GitHub Actions (from Gitea).
+- [ ] **Docker Optimization**: Further reduce image size.