Add volume change handling to ASR plugin

- Implemented an event listener for 'video:volumechange' to adjust the gain node's value based on the current volume of the artplayer instance.
- This enhancement ensures that the audio processing reflects the user's volume adjustments in real-time.

packages/artplayer-plugin-asr/src/index.js

@@ -256,6 +256,12 @@ export default function artplayerPluginAsr(option = {}) {
             workletLoaded = false;
         }
 
+        art.on('video:volumechange', () => {
+            if (gainNode) {
+                gainNode.gain.value = art.volume;
+            }
+        });
+
         art.on('play', startCapture);
         art.on('pause', stopCapture);
         art.on('destroy', destroy);