feat: implement role-based access control (RBAC) for API endpoints

issue_10.md

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+# 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.