Stops and removes all containers, networks, and optionally volumes associated with the current project. Also cleans up the state file at ~/.dokrypt/state/.The shutdown process:
Load state — Reads the project state file to find running containers
Stop containers — Sends SIGTERM, waits for graceful shutdown
Remove containers — Removes stopped containers
Remove network — Removes the project Docker network (only if all services stopped)
Remove volumes — If --volumes is set, removes persistent data
