* feat(gateway): typed structured questions on openclaw.chat
The chat result gains an additive optional question field (2-4 options, one
recommended max, per-option reply text). Producers: the two onboarding welcome
variants (apply-setup yes/ask, ready next-step) and hosted wizard select/confirm
steps, which mirror the awaited step so card clients render real wizard choices.
Prose replies always stand alone for text-only clients (macOS app, TUI). The
custodian page consumes the typed field and drops the PR1 string-marker parser
(never shipped in a release); cards send the option reply while the transcript
shows the label.
* chore: keep OnboardingWelcome type module-local
* chore(protocol): regenerate Swift bindings for the chat question field
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