Sign in as staff (Entra ID)

[CarsonL15]

As an admin, I want to sign in with my internal staff account, so that only authorized personnel can access the admin app and customer and system data stays protected.

Acceptance criteria:

• Unauthenticated visitors are redirected to an Entra ID sign-in flow
• Only users in the DeliveryBot-Admin Entra group can reach the app
• Signed-in users see their name and a sign-out control in the top nav
• Sign-out clears the session and returns the user to the sign-in page
• The user's identity is attached to all outbound API calls so the backend can audit admin actions