Allow user to docker prune all images and containers

This would clean up old artifacts and remove unnecessary stuff, right now people is using yacht, but it would be nice to have something in BlueOS

The issue names no file, test, or entry point, so first inspect how BlueOS currently exposes Docker or artifact-management actions and review the discussion around using Yacht. Define the supported cleanup scope and safety behavior, then verify that users can prune the intended images and containers without removing required resources.

Written by the indexing model from the issue text.