fix: define _guest_user() for tray/hotkey-triggered recording

api/router.py

@@ -12,6 +12,16 @@ router = APIRouter()
 _ws_clients: list[WebSocket] = []
 
 
+def _guest_user() -> dict:
+    """Return the first registered user — used for hotkey/tray-triggered recordings."""
+    from auth import _load_users
+    users = _load_users()
+    if not users:
+        raise RuntimeError("Kein Nutzer eingerichtet")
+    username, data = next(iter(users.items()))
+    return {"username": username, "output_dir": data["output_dir"], "is_admin": data.get("is_admin", False)}
+
+
 # ---------------------------------------------------------------------------
 # Auth dependency
 # ---------------------------------------------------------------------------