Should give more explicit prompt information when set require-oauth without port flag

[zhouying7780]

Description
When set --require-oauth=true , --authorization-url and --server-url without --port , the prompt information is confusingly.

./kubernetes-mcp-server --kubeconfig=/home/yinzhou/kubeconfig --log-level=9 --require-oauth=true --authorization-url=https://keycloak-keycloak.apps.yinzhou721.qe.devcluster.openshift.com/realms/master --server-url=localhost:8080 Error: authorization-url and server-url are only valid if require-oauth is enabled

Because port flag is missing, so that require-oauth is automatically set to false

[ardaguclu]

It makes sense to update the error message in here https://github.com/manusa/kubernetes-mcp-server/blob/775fa21bd1345eee52fea6089c119821c0d95c9e/pkg/kubernetes-mcp-server/cmd/root.go#L199 to warn about this implicit behavior.