initial setup

.gitignore

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+.venv/
+__pycache__/
+instance/
+*.pyc
+.env

app/__init__.py

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+from flask import Flask
+from flask_socketio import SocketIO
+
+sIO = SocketIO()
+
+def create_app():
+    app = Flask(__name__)
+    app.config['SECRET_KEY'] = 'dev'
+
+    sIO.init_app(app)
+
+    return app

requirements.txt

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+bidict==0.23.1
+blinker==1.9.0
+chess==1.11.2
+click==8.3.1
+dnspython==2.8.0
+eventlet==0.40.4
+Flask==3.1.3
+Flask-Login==0.6.3
+Flask-SocketIO==5.6.1
+greenlet==3.3.2
+h11==0.16.0
+itsdangerous==2.2.0
+Jinja2==3.1.6
+MarkupSafe==3.0.3
+python-chess==1.999
+python-engineio==4.13.1
+python-socketio==5.16.1
+simple-websocket==1.1.0
+Werkzeug==3.1.6
+wsproto==1.3.2

run.py

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+from app import create_app, sIO
+
+app = create_app()
+
+if __name__ == "__main__":
+    sIO.run(app, debug=True)