feat: implement authentication pages and route protection

[godwinameh]

"Implemented login and registration pages using Next.js App Router with client-side form validation via react-hook-form and Zod.

Added authentication API routes for login, registration, and logout handling. JWT tokens are now securely stored in httpOnly cookies to improve application security and prevent client-side token access.

Configured middleware to protect all /dashboard routes by redirecting unauthenticated users to the login page.

Also included:

• Root layout configuration for App Router
• Auth form structure and validation handling
• Secure cookie management
• Redirect flow after successful authentication
• Logout endpoint with cookie cleanup
• Initial dashboard route protection setup
• Improved frontend authentication architecture and folder structure"