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

## Description
Implement role-based access control for dispute-related endpoints to ensure that only authorized users (moderators and admins) can perform actions like changing dispute status or making final decisions.

## Acceptance Criteria
- [x] Middleware `requireRole` is properly implemented and tested
- [x] Dispute endpoints are secured with appropriate role checks
- [x] Integration tests verify role-based access control
- [x] Documentation of RBAC for dispute system is updated

## Related Files
- `backend/src/middleware/requireRole.js`
- `backend/src/controllers/dispute.controller.js`
- `backend/src/routes/disputes.routes.js`
- `backend/test/roles.test.js`

## Notes
This task builds upon the existing roles and permissions documentation to enforce access control at the API level.