feat: interactive setup wizard for first-run and netssh configure

- Auto-detects missing config (netbox.url empty) and launches wizard
- `netssh configure` re-runs the wizard anytime to change settings
- 3-page huh form: NetBox connection, SSH defaults, resolver & cache
- Saves to ~/.config/netssh.yaml (permissions 0600)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

go.sum

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