Updates the development server port from 5173 to 3003.
The documentation and configuration files incorrectly specified port 5173 for the development server. This caused confusion and prevented users from accessing the application at the correct address.
The port is updated in `DEPLOYMENT.md`, `README.md`, `USER_GUIDE.md` and `vite.config.ts` to ensure consistency and proper access to the development server on port 3003.
