[Feature Request]: Add WebSocket API route for streaming responses

[lizheng419]

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Is your feature request related to a problem?

Because WeChat Mini Programs require WebSocket communication, RagFlow needs a WebSocket API to support real-time streaming output. Without WebSocket support, the Mini Program cannot properly interact with RagFlow for chat or long-text generation.

Describe the feature you'd like

Add WebSocket API route for streaming responses

Describe implementation you've considered

No response

Documentation, adoption, use case

Additional information

No response

[James-4u]

@ZhenhangTung Could you please assign me this feature?

[James-4u]

@KevinHuSh I created a pr to fix this issue, can you plz check #11704