// Project structure
src/
├── components/
│   ├── ui/          # Reusable UI components
│   ├── features/    # Feature-specific components
│   └── layouts/     # Layout components
├── hooks/           # Custom React hooks
├── lib/             # Utilities and helpers
├── services/        # API services
└── types/           # TypeScript types

// Secure JWT authentication middleware
export async function authenticate(req: Request) {
  const token = req.headers.get('Authorization')?.split(' ')[1]
  
  if (!token) {
    throw new Error('No token provided')
  }
  
  try {
    const decoded = await verifyJWT(token)
    return { user: decoded, isAuthenticated: true }
  } catch (error) {
    throw new Error('Invalid token')
  }
}