feat(engine): 优化字幕引擎、提升程序健壮性

- 优化服务器启动流程，增加异常处理
- 主程序和字幕引擎的 WebSocket 端口号改为随机生成

engine/main.py

@@ -67,7 +67,7 @@ if __name__ == "__main__":
     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('-p', '--port', default=7070, help='The port to run the server on, 0 for no server')
+    parser.add_argument('-p', '--port', default=8080, help='The port to run the server on, 0 for no server')
     # gummy
     parser.add_argument('-s', '--source_language', default='en', help='Source language code')
     parser.add_argument('-t', '--target_language', default='zh', help='Target language code')

engine/utils/server.py

@@ -26,8 +26,13 @@ def handle_client(client_socket):
 
 def start_server(port: int):
     server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
-    server.bind(('localhost', port))
-    server.listen(1)
+    try:
+        server.bind(('localhost', port))
+        server.listen(1)
+    except Exception as e:
+        stderr(str(e))
+        stdout_cmd('kill')
+        return
     stdout_cmd('connect')
 
     client, addr = server.accept()