🚀 Feature: Implement User Authentication (JWT + Login/Register)

[bundlab]

Description

We need to implement a complete authentication system for TaskFlow Pro.

Requirements

Backend (FastAPI):

• User registration (POST /api/v1/auth/register)
• User login (POST /api/v1/auth/login)
• JWT Access + Refresh tokens
• Protected routes using dependency injection
• Password hashing with passlib[bcrypt]

Frontend (React):

• Login page
• Register page
• Protected routes (using React Router)
• Store auth token (httpOnly cookie or localStorage + context)
• Logout functionality

Acceptance Criteria

• Users can register with email + password
• Users can login and receive JWT tokens
• Protected endpoints return 401 if not authenticated
• Frontend redirects unauthenticated users to login
• Basic error handling and success messages

Related Files

• backend/app/core/security.py
• backend/app/api/v1/endpoints/auth.py
• backend/app/models/user.py
• backend/app/schemas/user.py
• frontend/src/pages/Login.tsx
• frontend/src/pages/Register.tsx

Priority

High - This is foundational for the whole application.

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