▶️ ÇıkıÅŸ Yaptım

1. UI: Profil dropdown > 'Çıkış'
2. POST /api/auth/logout
3. Backend: Refresh token invalidate (DB)
4. Cookie clear + localStorage clear (fvt-auth)
5. PostHog reset()
6. Redirect /giris

🔌 Endpoint'ler