# Issue #12: Implement Role-Based Access Control (RBAC) for Dispute Endpoints

## Description
Implement role-based access control for dispute-related endpoints to ensure that only users with the correct roles can perform specific actions within the dispute flow. This includes creating, viewing, and managing disputes.

## Acceptance Criteria
- [x] Middleware `requireRole` is implemented and tested
- [x] Dispute endpoints are protected by appropriate role checks
- [x] Integration tests verify that only authorized users can access dispute endpoints
- [x] Documentation of roles and permissions is updated

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

## Notes
This task builds upon the existing role-based access control implementation and ensures that dispute-related functionality is properly secured.