🔑 Migrate Authentication Routes

[sensasi-delight]

Refactor authentication routes to simplify URLs and improve user experience. Current routes are nested under /auth/... and will be migrated to root-level routes.

✅ Tasks

• Move /auth/login → /login
• Move /auth/register → /register
• Move /auth/logout → /logout
• Move /auth/email-verification → /email-verification
• Update navigation links/buttons across the app to use new paths
• Adjust redirects in authentication logic (login success, logout, registration)
• Remove or deprecate old /auth/... routes to avoid duplication

📌 Notes

• Use Next.js App Router conventions (folders under app/) for clean URLs.
• Ensure compatibility with better-auth integration.
• Double-check email verification and OAuth callback flows still work after migration.