Fix: /me-Endpoint gibt geburtstag zurück (war vergessen)

backend/routes/auth.py

@@ -242,7 +242,7 @@ async def me(user=Depends(get_current_user)):
                       notes_ki_enabled, gassi_stunde_push,
                       preferred_theme, subscription_tier,
                       subscription_expires_at, subscription_cancelled_at, needs_dog_selection,
-                      billing_address
+                      billing_address, geburtstag
                FROM users WHERE id=?""",
             (user["id"],)
         ).fetchone()