bootnode is its own GitHub org — its images belong in its own GHCR namespace,
per the never-mix-registries rule. This also removes cross-org friction: the
repo's own GITHUB_TOKEN pushes to ghcr.io/bootnode/* (same org), so once the
arcd App is on the bootnode org, build+push needs no cross-org token.
Updated all container image references across compose, K8s manifests,
cloud deploy scripts, and tests to use the ghcr.io/hanzoai/bootnode
registry format.