feat: initial Luma implementation

Full self-hosted photo manager with:
- Ingestion worker (chokidar + sharp + exifr, dHash perceptual hashing)
- SQLite schema with WAL mode (photos, tags, collections, duplicate_pairs)
- Express API with keyset pagination, tag/collection/search/date filters
- React + Vite UI: timeline, lightbox, detail panel, tag/collection editors
- Duplicate detection (Union-Find grouping) with review + dismiss UI
- Map view (Leaflet + OpenStreetMap, marker clustering)
- Docker multi-stage build + Compose with inline env config
- GitHub Actions: CI build check + ghcr.io image publish on main/tags

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,39 @@
+services:
+
+  server:
+    build: .
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    environment:
+      PORT: "3000"
+      DB_PATH: /data/library.db
+      POSTER_DIR: /data/posters
+      NODE_ENV: production
+    volumes:
+      - luma_data:/data
+      - /your/photo/directory:/photos:ro    # ← change this path
+    healthcheck:
+      test: ["CMD", "wget", "-qO-", "http://localhost:3000/api/health"]
+      interval: 30s
+      timeout: 5s
+      retries: 3
+      start_period: 10s
+
+  worker:
+    build: .
+    restart: unless-stopped
+    command: ["node", "worker/index.js"]
+    environment:
+      DB_PATH: /data/library.db
+      POSTER_DIR: /data/posters
+      PHOTO_DIR: /photos
+    volumes:
+      - luma_data:/data
+      - /your/photo/directory:/photos:ro    # ← same path as server
+    depends_on:
+      server:
+        condition: service_healthy
+
+volumes:
+  luma_data: