Allow connecting to an OneCLI gateway running on another host instead
of installing one locally. Adds a third choice ('Connect to a remote
OneCLI') alongside reuse/fresh in the setup wizard, prompts for the
remote URL, validates reachability before proceeding, and passes
--remote-url to the onecli step.
In onecli.ts: extracts installOnecliCliOnly() for the remote path
(installs the CLI binary but skips the gateway), exports pollHealth
for use by auto.ts, and handles --remote-url to configure api-host
and write ONECLI_URL to .env without running the full gateway install.
Emmanuel Venisse
6b431c195d