bug fix for multimodal-dialog agent and add parameter speaker_id in asr result

[songguocola]

No description provided.

[gemini-code-assist]

Code Review

This pull request introduces graceful shutdown and resource cleanup mechanisms for the WebSocket clients, specifically adding timeout-based graceful stops and idempotent force-close logic in MultiModalDialog, as well as cancellation propagation and retry bailing in OkHttpWebSocketClient. A critical issue was identified in OkHttpWebSocketClient where the isClosed flag is never reset to false after being set to true during a cancellation, which will cause any subsequent requests on a reused client instance to be silently ignored.

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