fix #2587: Resolve VAD multithreading issue (#2613)

majic31

2025-08-14 5115a066c971b2380c98f9be168e14869053eda1

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BAC009S0764W0121 <|Speech|>
BAC009S0916W0489 <|Speech|>
asr_example_cn_en <|Speech|>
ID0012W0014 <|Speech|>