feat(auth): implement user authentication and email verification

Add registration, login, and logout flows with session management
Integrate Resend for email verification tokens
Create frontend auth views and update topbar state

.env.example

@@ -3,4 +3,8 @@ POSTGRES_USER=pokopia
 POSTGRES_PASSWORD=pokopia
 DATABASE_URL=postgres://pokopia:pokopia@localhost:5432/pokopia
 BACKEND_PORT=3001
+FRONTEND_ORIGIN=http://localhost:3000
+APP_ORIGIN=http://localhost:3000
 VITE_API_BASE_URL=http://localhost:3001
+RESEND_API_KEY=
+EMAIL_FROM="Pokopia Wiki <onboarding@resend.dev>"