▶️ Google ile Giriş

  1. UI: /giris > 'Google ile GiriÅŸ' button
  2. GET /api/auth/google → 302 Redirect to accounts.google.com
  3. Google consent screen → onay
  4. Callback /api/auth/google/callback?code=...
  5. Backend: code → Google token exchange → user info
  6. Mevcut user mu yeni mi check → otomatik register/login
  7. Set session cookie + redirect /

🔌 Endpoint'ler

GET/api/auth/google