ai-call-ws is running.
  /ws    (v1 Gemini Live): model=gemini-3.1-flash-live-preview
  /ws    (v1 OpenAI Realtime): enabled (mini / preview, config.model で切替)
  /ws-v2 (v2 clips 式 OpenAI Realtime): enabled
  /ws-monitor?aiCallLogId=... (管理画面の通話監視・transcript push): enabled
  POST /originate (Asterisk ARI 経由のアウトバウンド発信、 内部 secret 認証): enabled