[new]降低采样率为24000

lib/module/record/record_handler.dart

@@ -49,7 +49,7 @@ class RecordHandler {
 
   static final RecordConfig recordConfig = RecordConfig(
     codec: Codec.pcm16,
-    sampleRate: SampleRate.rate44_1k.value,
+    sampleRate: SampleRate.rate24k.value,
     numChannels: Channel.mono.value,
   );
   StreamSubscription? _recorderSubscription;