Persist realtime OpenClaw consult results

[rogerchappel]

Summary

• return the completed OpenClaw answer from the realtime relay route as finalText
• suppress stale provider assistant transcripts while a realtime tool call is pending
• persist the actual OpenClaw final text into CrewCMD once the relay call completes

Verification

• pnpm test -- 'src/app/api/runtimes/[id]/talk/realtime/relay/route.test.ts' src/lib/realtime-voice-gateway-relay.test.ts src/lib/realtime-voice-client.test.ts\n- pnpm typecheck\n- git diff --check origin/main..HEAD\n- pre-push: pnpm typecheck && pnpm build\n\n## Notes\nThe earlier continuation fix is already merged in main. OpenClaw logs showed the VideoGen lookup completed and returned the README summary, but the realtime provider still emitted stale “no README text” transcript content. This PR makes CrewCMD trust and persist the final OpenClaw tool result instead.