# Issue: Implement Role-Based Access Control (RBAC) for API Endpoints

## Description
Implement role-based access control (RBAC) for the API endpoints to ensure that users can only access resources and perform actions according to their assigned roles (`user`, `moderator`, `admin`).

## Acceptance Criteria
- [x] Role middleware is implemented and tested
- [x] API endpoints are secured with appropriate role checks
- [x] Audit logging is implemented for sensitive actions
- [x] Documentation of the RBAC system is updated

## Related Files
- `backend/middleware/role.middleware.js`
- `backend/controllers/`
- `backend/routes/`

## Notes
This issue builds upon the existing roles and permissions documentation in `docs/roles-and-permissions.md`. The implementation should follow the principles outlined in that document.