Update all docker-compose files to use environment variables for data paths:
- docker-compose.local.yml: Use LOCAL_DATA_DIR with fallback to ../data/dev
- docker-compose.prod.yml: Use PROD_DATA_DIR with fallback to data/prod
- docker-compose.prod.smoke.yml: Use SMOKE_TEST_DATA_DIR with fallback
This allows smoke tests and local development to use temp directories
instead of repo-relative paths, avoiding file sharing permission issues
on macOS with Docker Desktop or Colima.