chore: consolidate dev-docs and plans into docs/

docs/dev/IDEAS.md

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+# Portfolio Ideas
+
+## 🧑‍💻 Developer
+
+- **Internationalization (i18n)** — Multi-language UI support (DE/EN). Extend YAML config with locale files
+- **ISR / Stale-While-Revalidate** — Replace `force-dynamic` with Incremental Static Regeneration + on-demand revalidation
+- **CI/CD pipeline** — GitHub Actions: lint → typecheck → unit tests → Playwright E2E → Docker build → push to GHCR _(Playwright tests exist, needs GH Actions workflow)_
+- **Privacy-friendly analytics** — Plausible or Umami (self-hosted) to track album/photo engagement
+
+## 📸 Photographer
+
+- **Photo stories / Essays** — Vertical scroll format with images + text interspersed, like a photo essay. Portfolio differentiator
+- **Map view** — Minimal world map from EXIF city/country data, each dot links to an album. Mapbox GL or Leaflet
+- **Monochrome / Film simulation toggle** — CSS filters for grayscale, Tri-X, Portra 400 looks across the grid
+- **Collections by camera/lens** — Auto-generate virtual albums from EXIF data ("Shot on Leica Q3", "Summilux 35mm")
+
+## 👤 User / Visitor
+
+- **Slideshow mode** — Auto-advance through photos (3s/5s/10s). Great for exhibitions and ambient display
+- **Photo sharing** — "Copy link" button in lightbox with toast notification
+- **Keyboard shortcut hints** — `?` button revealing available shortcuts (arrows, Esc, F for fullscreen)
+- **Fullscreen API** — Chrome-free immersive viewing in lightbox
+- **Pinch-to-zoom** — Touch gesture zoom in lightbox for detail viewing
+- **Progressive loading animation** — Ken Burns zoom/pan on ThumbHash placeholders while loading
+
+## 🏆 Quick Wins (High Impact / Low Effort)
+
+| Idea | Effort | Impact |
+|------|--------|--------|
+| Slideshow mode | Low | High — exhibition ready |
+| Fullscreen API in lightbox | Low | Medium — immersive |
+| Monochrome toggle | Low | Medium — Leica vibes |
+| ISR caching | Medium | High — performance |
+| Photo stories/essays | High | Very high — differentiator |
+| Map view | Medium | High — wow factor |
+
+## ✅ Already Implemented
+
+| Feature | Notes |
+|---------|-------|
+| Image CDN / Edge caching | `Cache-Control: immutable` on `/api/image` proxy |
+| OG image generation | Dynamic OG images via `/api/og` |
+| Hero image carousel | Crossfade carousel from `gallery.yaml` hero images |
+| EXIF metadata display | Print-style captions on photo grid hover |
+| Per-album password protection | Cookie-based auth gate per subpage |
+| Asset ID obfuscation | AES-encrypted tokens in public URLs |
+| Rate limiting | On image proxy endpoint |
+| YAML-based config | `gallery.yaml` replaces env-var config |
+| Playwright E2E tests | Basic test suite in `e2e/` |
+| Fade-in animations | Intersection Observer based |
+| Theme toggle (dark/light) | Persisted via cookie |
+| Scroll-to-top button | Appears on scroll |
+| Footer with social links | Configurable via `gallery.yaml` |
+| Image count badges | On subpage cover tiles |
+| Custom cursor (crosshair) | On photo grid items |
+| About page | Markdown-driven with portrait + gear |
+| Content Security Policy | CSP + security headers in `next.config.ts` |
+| Album descriptions | Uses Immich's built-in album description field |