Implement Authentication Module with JWT Support

[memplethee-lab]

Overview

Create a comprehensive authentication module for the Alian Structure API to handle user identity verification and authorization using JWT (JSON Web Tokens).

Direction

This module should provide:

• User registration with email/password
• User login with credential validation
• JWT token generation and refresh mechanism
• Token verification middleware
• Password hashing using industry-standard algorithms (bcrypt)
• Session management capabilities

Implementation Details

The authentication module should be implemented as a dedicated service that integrates with the API's request pipeline. It should support both access and refresh tokens with configurable expiration times.

Acceptance Criteria

• User registration endpoint accepts email and password, validates input, and stores user securely
• User login endpoint authenticates credentials and returns valid JWT tokens
• JWT tokens include user ID and expiration claims
• Refresh token endpoint generates new access token without re-authentication
• Authentication middleware protects routes and validates tokens on each request
• Passwords are hashed using bcrypt with minimum 10 salt rounds
• All authentication endpoints include proper error handling and validation messages
• Unit tests cover all auth workflows with >85% code coverage
• API documentation includes authentication flow and token usage examples

[shepherd-001]

Hello, I've reviewed the issue, and I'm confident I can resolve it. I have experience with authentication services. Please assign this task to me.