feat(auth): Add Google OAuth with NextAuth and secure dashboard route

[Ad1th]

Features

• Integrated Google OAuth using next-auth.
• Added middleware to protect /dashboard and future admin routes.
• Created a simple /login page with a "Login with Google" button.
• Ensured dashboard is only accessible after login.
• All credentials are loaded from .env.local.

Security

• Routes under /dashboard and /admin are protected by session-based auth.
• Redirects to /login if the user is unauthenticated.

Setup

Make sure to add the following to .env.local:

GOOGLE_CLIENT_ID=your-google-client-id
GOOGLE_CLIENT_SECRET=your-google-client-secret
NEXTAUTH_SECRET=your-generated-secret
NEXTAUTH_URL=http://localhost:3000

Generate the NEXTAUTH_SECRET via:

openssl rand -base64 32

Video reference:
https://github.com/user-attachments/assets/3bee3ed7-db59-4f30-8e5c-46fcf05ab4b2

Images: