Enhance Ticket management functionalities

run.py

@@ -1,7 +1,14 @@
+# eventlet monkey-patching MUST happen before any other imports.
+# Without this, eventlet cannot patch the standard library's socket/threading
+# modules, which causes [Errno 9] Bad file descriptor errors under gunicorn
+# and makes SMTP connections unreliable in background threads.
+import eventlet
+eventlet.monkey_patch()
+
 import os
 from app import create_app, socketio
 
 app = create_app(os.environ.get('FLASK_ENV', 'production'))
 
 if __name__ == '__main__':
-    socketio.run(app, host='0.0.0.0', port=5000, debug=app.debug)
+    socketio.run(app, host='0.0.0.0', port=5500, debug=app.debug)