Issue: Add Unit Tests for JWT Authentication Guard

[NahomAlemu]

Description

The jwt-auth.guard.ts protects all authenticated routes by validating JWT tokens. No test coverage exists. A bug could expose protected routes or block legitimate users.

Tasks

Tasks:

• Create `jwt-auth.guard.spec.ts` test file
• Test that public routes bypass JWT validation
• Test that private routes require valid JWT tokens
• Test handling of expired tokens
• Test handling of malformed tokens
• Test missing token scenarios
• Ensure 100% code coverage for the guard"

Visual Aids

[NahomAlemu]

Closing this as my practicum has concluded and the associated PR has been withdrawn. The branch remains available for reference.