Changelog

- Persist Docker image registry mappings so selected private registry credentials are reused for later pulls and recreates.
- Retry same-host registry credentials for existing containers, deployments, and webhooks, then remember the credential that succeeds.
- Add registry selection to the Docker deploy dialog and route explicit registry choices through container and deployment creation.
- Remove unauthenticated AI image-update pre-pull so updates use the shared registry-aware recreate path.