Student logs out of account

[aziztarrouche0]

User Story:
As a logged-in student,
I want to log out of my account,
so that I can protect my data when using a shared device.

User Type: Registered student (authenticated)

Main Goal:
Enable users to securely end their session and clear authentication state.

Backend Responsibilities (Node.js / Express):

• Accept logout request
• Invalidate authentication token if using token blacklist approach
• Clear any server-side session data

Database Responsibilities (MongoDB):

• Update last logout timestamp (optional)
• Add token to blacklist collection if using token invalidation (optional)

Dependencies / Assumptions:

• User must be logged in