Fix: scale-app could stay stuck indefinitely on a container name conflict, never…

v0.20.6-beta

Fix: scale-app could stay stuck indefinitely on a container name conflict, never recovering. An orphan container left by a previous scale attempt (crash, interruption) occupied the name Docker wanted to give the next replica, making docker compose up --scale fail with a conflict error — the deployment path (deploy_app.go) already knows how to self-heal this case by removing the conflicting container and retrying, but scale-app did not. The same mechanism is now carried over to the scale path.