Implement JWT Authentication

[Hamzaa6296]

Description:

What needs to be done

• Create auth module
• Create user module with User schema
• Implement POST /auth/signup
• Implement POST /auth/login
• Generate JWT access token on login
• Create JWT auth guard
• Protect routes with JWT guard

Acceptance Criteria

• POST /auth/signup creates new user
• POST /auth/login returns JWT token
• Protected routes return 401 without token
• Passwords are hashed with bcrypt