saloniasthana/UpSkill ? reverse-engineered prompt

Build me a full stack online course marketplace called UpSkill where any signed up user can become an instructor, create paid courses, and also upload free PDF notes for other people to view and download. Users should be able to register, log in, edit their profile, browse and search courses, buy courses with Stripe in INR, and leave reviews only after they’ve actually purchased a course. I want a clean, responsive dark themed interface, with separate student and instructor flows, protected pages for logged in users, and an instructor dashboard for adding, updating, and deleting their own courses. Please wire up the frontend and backend, store data in MongoDB, use JWT based auth, and handle file uploads for course images and PDFs. If anything is unclear, use the current docs online and make sensible choices so the app feels polished and ready to use.