fix(panel): streamline system settings and server creation

Use shared action buttons and default to the login space. Allow staff to save startup-only experience settings while running and request a durable restart through the existing operator flow.

Grant the API PVC list permission needed to detect retained worlds before server creation, and show internal failures with a request ID. Cover permission, maintenance, restart and UI behavior with regression checks.

internal/apis/felis/v1alpha1/minecraftserver_types.go

@@ -39,6 +39,8 @@ const (
 	// the automatic restarts were spent. The operator takes the request once —
 	// fresh restart budget, new start anchor, pod recreated — and removes it.
 	AnnotationStartRetry = GroupName + "/start-retry"
+	// AnnotationRestart requests one pod recreation while keeping desiredState Running.
+	AnnotationRestart = GroupName + "/restart"
 )
 
 // ForwardingLegacy is the LabelForwarding value that selects legacy forwarding.