refactor(engine): 修改虚拟环境设置，修改音频工具函数

- 更新虚拟环境目录名为 .venv
- 调整音频块采集速率默认值为 10
- 为 AudioStream 类添加重设音频块大小的方法
- 更新依赖文件 requirements.txt

engine/main.py

@@ -67,7 +67,7 @@ if __name__ == "__main__":
     # both
     parser.add_argument('-e', '--caption_engine', default='gummy', help='Caption engine: gummy or vosk')
     parser.add_argument('-a', '--audio_type', default=0, help='Audio stream source: 0 for output, 1 for input')
-    parser.add_argument('-c', '--chunk_rate', default=20, help='Number of audio stream chunks collected per second')
+    parser.add_argument('-c', '--chunk_rate', default=10, help='Number of audio stream chunks collected per second')
     parser.add_argument('-p', '--port', default=8080, help='The port to run the server on, 0 for no server')
     # gummy only
     parser.add_argument('-s', '--source_language', default='en', help='Source language code')