Implement role-based access control (RBAC)

[kmuwanga83]

📌 Problem

All users may currently have the same level of access.

🎯 Objective

Restrict access based on user roles.

✅ Tasks

• Define roles (e.g., Admin, fireman, User)
• Restrict certain actions/pages by role
• Update backend and frontend logic

🧪 Acceptance Criteria

• Users can only access authorized features
• Unauthorized access is blocked
• Roles are clearly defined