Start cognee from the Docker image

Fastest path: prebuilt image, one file

For a local try-out, do NOT clone or build anything. Follow docs/minimal-docker-compose.md: save this as docker-compose.yml in an empty directory:

services:
  cognee:
    image: cognee/cognee:main
    ports:
      - "8000:8000"
    environment:
      LLM_API_KEY: ${LLM_API_KEY:?set LLM_API_KEY to your OpenAI API key}
      # Single-user try-out: no auth, shared local databases.
      ENABLE_BACKEND_ACCESS_CONTROL: "false"