feat: implement user authentication and admin management

- Add user management API endpoints for listing and creating users.
- Implement login and logout functionality with rate limiting.
- Create UI components for login form, logout button, and animated elements.
- Add session management with JWT and secure cookie handling.
- Seed initial admin user if no users exist.
- Introduce utility functions for password hashing and user authentication.
- Set up proxy middleware for route protection and security headers.
- Create a JSON file for user data storage.
- Add links configuration for external resources.

frontend/app/api/auth/logout/route.ts

@@ -0,0 +1,7 @@
+import { NextResponse } from 'next/server'
+import { deleteSession } from '@/lib/session'
+
+export async function POST() {
+  await deleteSession()
+  return NextResponse.json({ ok: true })
+}