[Feature Request] support IM channel feature

[terasum]

Motivation:

• the IM channel can obviously enhance the usage rate of Claurst
• and we want integrate with our mobile agent client

Please consider implements the IM streaming channel, if integrate openclaw's IM plugin smoothly will be better.

[Kuberwastaken]

@terasum Not openclaw style IM but mobile remote sessions is in pipeline, will update