Restructure the `--vc` CLI option

[in03]

The --vc version constraint override option must be applied like so:

proxima --vc my-key queue or proxima --vc my-key work 4

Although it means less boilerplate in code by adding the option to the typer callback, it's really unintuitive. Looking for subcommand help doesn't help either, since --help always works on the command level. Plus it's silly if future subcommands don't support the option...