Handle websocket pings in JRPC handler

[merolish]

Summary

• handle websocket control frames in the JRPC loop instead of attempting to parse them as JSON-RPC messages
• rely on soketto's automatic handling of Ping frames and ignore Pong acknowledgements rather than replying to Pong frames
• keep the handler responsive by exiting cleanly when the socket closes

Testing

• cargo check --locked

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Codex Task

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Project	Deployment	Review	Updated (UTC)
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[merolish]

After testing, I confirmed that even without this PR the client receives pong responses, so this may not be needed (although it's probably better practice).