fix(audio): defer and coalesce role switch notices

ql-application/threadx/interface/custom_app/vad_det.c

@@ -46,6 +46,7 @@ extern ql_sem_t sender_sem;
 extern void conversation_no_speech(void);
 extern void conversation_record_begin(void);
 extern void conversation_cancel_wait(void);
+extern int app_role_notice_before_finish(void);
 
 // 配置
 static int sample_rate = 16000;             // FVAD 支持的采样率：8k/16k/32k/48k
@@ -502,6 +503,7 @@ void vad_audio_process(void) {
             
         case STATE_WAITING_COMMAND:
 			if(vad_tts_playback_finished_status == 1) {
+                if (app_role_notice_before_finish()) break;
 				int leave_message_finished = vad_leave_message_flag != 0;
                 printf("finished_status:%d, no_speech_timeout:%d\n", vad_tts_playback_finished_status, no_speech_timeout);
                 set_state(STATE_IDLE);