Module auth

Description

Authentication API service for user login and JWT token handling.

Responsibilities:

• Handle user login requests to the backend
• Extract and decode JWT tokens from responses
• Parse user role from JWT payload
• Error handling and validation

Security Notes:

• JWT tokens are decoded client-side (payload only, signature verification via backend)
• Passwords are never logged or stored locally
• Token should be stored securely (HttpOnly cookies preferred, localStorage fallback)