update start.sh

Author: yilinxia

start.sh

@@ -1,14 +1,14 @@
 #!/bin/bash
 
-# Start the Flask backend server in the background
+# Start the Gunicorn backend server in the background
 echo "Starting backend server..."
-cd backend
-python topic_processor.py &
+cd backend/app
+gunicorn -b 127.0.0.1:5002 main:app &
 
 # Wait a moment for the backend to start
 sleep 2
 
 # Start the frontend development server
 echo "Starting frontend server..."
-cd ..
+cd ../..
 npm start