feat: add Docker deployment support

- Add Dockerfile with Node.js 18 alpine build
- Add docker-compose.yml with environment configuration
- Add docs/DOCKER.md deployment guide
- Update README.md with Docker quick start section
- Server binds to 0.0.0.0:3333 for external access
- UI available at http://localhost:3333/ui/
- Volumes mounted for reports and evidence persistence

docker-compose.yml

@@ -0,0 +1,22 @@
+services:
+  app:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: t3mp3st
+    restart: unless-stopped
+    env_file:
+      - .env
+    environment:
+      - T3MP3ST_HOST=0.0.0.0
+      - T3MP3ST_PORT=3333
+    volumes:
+      - ./reports:/app/reports
+      - ./evidence:/app/evidence
+    ports:
+      - "3333:3333"
+    healthcheck:
+      test: ["CMD", "node", "-e", "process.exit(0)"]
+      interval: 30s
+      timeout: 10s
+      retries: 3