kube-router: GoBGP gRPC Admin Port Exposed on Node Primary IP Without Authentication, Allowing Cluster-Wide BGP Route Injection

Summary When the kube-router routing controller starts --run-router, it binds the GoBGP gRPC management server to the node's primary IP e.g., 192.168.1.10:50051 in addition to 127.0.0.1:50051. The default admin port is 50051 and the server is enabled by default with no TLS and no authentication...