Add Docker deployment for Unraid

- Dockerfile with nginx:alpine for static file serving
- docker-compose.yml with port 9113:80 mapping
- deploy.sh for git-based deployment to Unraid
- setup-unraid.sh for initial server configuration
- manage.sh for container operations (logs, status, restart, etc.)
- .gitignore to exclude config.js

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,12 @@
+services:
+  unraid-dash:
+    build: .
+    container_name: unraid-dash
+    restart: unless-stopped
+    ports:
+      - "9113:80"
+    logging:
+      driver: "json-file"
+      options:
+        max-size: "10m"
+        max-file: "3"