Admin can log out of the portal

[jonadavrivera]

User Story

Title:
As an admin, I want to log out of the portal, so that I can protect access to the platform.

Acceptance Criteria:

1. The admin can select a logout option.
2. The current session is invalidated.
3. The admin is redirected to the login page.
4. Protected pages cannot be accessed after logging out.

Priority: High

Story Points: 2

Notes:

• The session token or cookie must be invalidated.