Add interactive wizard to `entire repo create`

With a name and --project the repo is still created directly. Missing either, a terminal gets a paged wizard (project → name → visibility → advanced → object format → summary) modeled on project create, seeded from whatever was given; no terminal is refused before any request.

• Only projects the caller can create repositories in are offered; a --project naming none of them fails before the form.
• The name is checked against the chosen project's repos, loaded in the background; a 409 at create reopens the wizard.
• New --visibility flag (wizard default private), applied after the create since the endpoint takes none; a failure keeps the repo and prints the repo edit that finishes the job.
• Output names the repo as <project>/<repo> and prints next steps: clone it or point origin at it, then mirror it.