Add idle auto-shutdown configuration to deployment

- IDLE_TIMEOUT_MINUTES env var (default 30 min)
- restart: no policy so container stays stopped
- Optional wakeup service for auto-restart
- Document three restart options in readme

deploy/docker-compose.yml

@@ -0,0 +1,64 @@
+services:
+  streamlit:
+    build:
+      context: ..
+      dockerfile: Dockerfile
+    container_name: py-dvt-ate-streamlit
+    restart: "no"  # Don't auto-restart - we want it to stay stopped when idle
+    environment:
+      - IDLE_TIMEOUT_MINUTES=${IDLE_TIMEOUT_MINUTES:-30}
+    expose:
+      - "8080"
+    volumes:
+      - ./data:/app/data
+    networks:
+      - dvt-ate
+
+  nginx:
+    image: nginx:alpine
+    container_name: py-dvt-ate-nginx
+    restart: unless-stopped
+    volumes:
+      - ./nginx.conf:/etc/nginx/nginx.conf:ro
+    expose:
+      - "80"
+    depends_on:
+      - streamlit
+    networks:
+      - dvt-ate
+
+  cloudflared:
+    image: cloudflare/cloudflared:latest
+    container_name: py-dvt-ate-tunnel
+    restart: unless-stopped
+    command: tunnel run
+    environment:
+      - TUNNEL_TOKEN=${CLOUDFLARE_TUNNEL_TOKEN}
+    depends_on:
+      - nginx
+    networks:
+      - dvt-ate
+
+  # Optional: Auto-start streamlit when stopped (checks every 30s)
+  # Uncomment if you want fully automatic restart on visit
+  # wakeup:
+  #   image: docker:cli
+  #   container_name: py-dvt-ate-wakeup
+  #   restart: unless-stopped
+  #   entrypoint: /bin/sh
+  #   command:
+  #     - -c
+  #     - |
+  #       while true; do
+  #         sleep 30
+  #         if ! docker inspect -f '{{.State.Running}}' py-dvt-ate-streamlit 2>/dev/null | grep -q true; then
+  #           echo "[$(date)] Starting streamlit..."
+  #           docker start py-dvt-ate-streamlit
+  #         fi
+  #       done
+  #   volumes:
+  #     - /var/run/docker.sock:/var/run/docker.sock:ro
+
+networks:
+  dvt-ate:
+    driver: bridge