[router] regular router circuit breaker (#8997)

sgl-router/py_src/sglang_router/launch_server.py

@@ -158,6 +158,7 @@ def main():
         default=31000,
         help="Base port number for data parallel workers",
     )
+    # No extra retry/CB flags here; RouterArgs.add_cli_args already defines them with router- prefix
 
     args = parser.parse_args()
     server_args = ServerArgs.from_cli_args(args)