fix(ws): make WebSocket token parameter optional

Required token query param caused connection failures for clients
that authenticate via other means.

media_server/routes/media.py

@@ -323,7 +323,7 @@ async def set_visualizer_device(
 @router.websocket("/ws")
 async def websocket_endpoint(
     websocket: WebSocket,
-    token: str = Query(..., description="API authentication token"),
+    token: str | None = Query(None, description="API authentication token"),
 ) -> None:
     """WebSocket endpoint for real-time media status updates.