Description:

Set up admin authentication using NextAuth.js (Auth.js) with credentials provider. This includes login/logout functionality, session management, and middleware to protect admin routes.

Tasks:

• Install and configure NextAuth.js with credentials provider
• Create login page at src/app/admin/login/page.tsx
• Implement password hashing utilities (bcrypt)
• Set up authentication middleware to protect /admin/* routes
• Create session utilities in src/lib/auth/
• Add logout functionality
• Seed an initial admin user for testing