Implement User Authentication and Authorisation for Personalised Pages

[AttiR]

Currently, all users have access to the same pages and data, including cleaning jobs and analysis results. To improve security and user experience, implement authentication and authorization so that:

• Each user can log in and access only their own data and jobs.
• Cleaning jobs, datasets, and analysis results should be visible only to the user who created them.
• Add user-specific dashboard and job pages.
• Ensure backend API endpoints enforce user-based access control.
• Update frontend to show only the logged-in user’s work.
• Consider using JWT tokens or OAuth for authentication.

This will ensure privacy, data protection, and a personalized experience for every user.