Add git-centric deployment with Docker builds and vanity imports

New deployment model where projects start with a git remote on the VPS.
Pushing to the remote triggers automatic docker build and deploy via
post-receive hooks. The base domain serves Go vanity imports and git
HTTPS cloning via Caddy + fcgiwrap.

- Add `ship init <name>` command to create bare repos and .ship/ config
- Add `ship deploy <name>` command for manual rebuilds
- Extend `ship host init --base-domain` to set up Docker, git user,
  fcgiwrap, sudoers, and vanity import infrastructure
- Add git-app and git-static types alongside existing app and static
- Update remove, status, logs, restart, list, and config-update to
  handle new types

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