feat: initial full-stack nyaa-crawler implementation

- Node.js + TypeScript + Express backend using built-in node:sqlite
- React + Vite frontend with dark-themed UI
- Nyaa.si RSS polling via fast-xml-parser
- Watch list with show/episode CRUD and status tracking
- Auto-download scheduler with node-cron (configurable interval)
- .torrent file downloader with batch-release filtering
- Settings page for poll interval and quality defaults
- Dockerfile and docker-compose for Unraid deployment
- SQLite DB with migrations (shows, episodes, settings tables)

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

docker-compose.yml

@@ -0,0 +1,14 @@
+services:
+  nyaa-watcher:
+    build: .
+    container_name: nyaa-watcher
+    restart: unless-stopped
+    environment:
+      - PORT=3000
+      - POLL_INTERVAL_SECONDS=900
+      - TORRENT_OUTPUT_DIR=/data/torrents
+      - DATABASE_PATH=/data/db.sqlite
+    volumes:
+      - ./data:/data
+    ports:
+      - "8082:3000"