Add Rate Limiting to API Endpoints

[tsahil01]

• Description: Prevent abuse by limiting requests to specific endpoints.
  • Tasks:
    • [ ] Use a rate-limiting middleware, like express-rate-limit, to protect routes.
    • [ ] Apply the rate limiter on sensitive routes, such as /api/uploadVideo and /api/payment.
    • [ ] Configure rate limits based on user roles.
    • [ ] Test that rate limiting works as expected.