feat: stream realtime asr from helper

cai

2026-07-10 a590c735cfa4ec55ba6b32e297600d83e1a3e46a

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[source.crates-io]
replace-with = "rsproxy"
 
[source.rsproxy]
registry = "sparse+https://rsproxy.cn/index/"
 
[net]
retry = 5