# Implement comprehensive RBAC documentation and tests

## Description
The project needs comprehensive documentation and tests for the role-based access control (RBAC) system that has been implemented. This includes:

1. Detailed documentation of the roles and permissions in `docs/roles-and-permissions.md`
2. Tests for the middleware in `backend/middleware/role.middleware.js`
3. Integration tests for routes that use the middleware

## Acceptance Criteria
- [ ] Documentation of all roles and their permissions is complete
- [ ] Middleware tests cover all scenarios (authorized, unauthorized, missing role)
- [ ] Integration tests verify route protection with different user roles
- [ ] All tests pass successfully
- [ ] Documentation is consistent with implementation

## Tasks
- [ ] Update `docs/roles-and-permissions.md` with complete role matrix and examples
- [ ] Add integration tests for protected routes
- [ ] Run all tests to verify functionality