feat(security): require setup token for admin init and restore [BE-13029] (#2770)

api/http/handler/users/handler.go

@@ -35,6 +35,7 @@ type Handler struct {
 	passwordStrengthChecker security.PasswordStrengthChecker
 	AdminCreationDone       chan<- struct{}
 	FileService             portainer.FileService
+	SetupToken              string
 }
 
 // NewHandler creates a handler to manage user operations.