Add eventlet and set async_mode to eventlet for SocketIO

requirements.txt

@@ -5,3 +5,4 @@ flask-login>=0.6
 flask-sqlalchemy>=3.1
 werkzeug>=3.1
 flask-socketio>=5.0
+eventlet>=0.33
\ No newline at end of file

wssshd.py

@@ -56,7 +56,7 @@ db = SQLAlchemy(app)
 login_manager = LoginManager()
 login_manager.init_app(app)
 login_manager.login_view = 'login'
-socketio = SocketIO(app)
+socketio = SocketIO(app, async_mode='eventlet')
 
 class User(UserMixin, db.Model):
     id = db.Column(db.Integer, primary_key=True)