修复在触发较长音频（如关羽之歌）后再次说出关键词触发同时播放的情况 - #5
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连续触发关键词时，
play_audio()会为每次触发创建独立播放线程。pygame mixer 可同时使用多个声道，导致同一音频可能叠播。
因此
-在
MainWindow增加全局播放互斥锁；finally统一解除扬声器递归保护并释放锁。