Implement User Login

[Ram-Raghav-S]

Description: Allow users to log in using token auth.

Tasks:

1. Create API Endpoint:
   • Route: POST /api/auth/login
   • Controller:
     • Validate input data (email, password) using Joi.
     • Retrieve user by email from the database.
     • Compare provided password with stored hashed password using bcryptjs.
     • Generate a JWT token with user information.
     • Return the JWT token and user details.

Acceptance Criteria:

• Users can log in with valid credentials.
• JWT tokens are generated and returned upon successful login.
• Invalid login attempts return appropriate error messages.
• Login endpoint is tested and documented.