fix(nodes): make node API tokens write-only (#5613)

* fix(nodes): make node API tokens write-only

* fix(nodes): keep token optional on edit for write-only API tokens

NodeView no longer returns apiToken, so the edit form must consume hasApiToken and not require re-entering the token. Relaxes the form validation on edit, adds a keep-current placeholder, and adds the i18n key to all 13 locales.

internal/web/service/node_tree.go

@@ -157,6 +157,14 @@ func (s *NodeService) GetNodeTree() ([]*model.Node, error) {
 	return all, nil
 }
 
+func (s *NodeService) GetNodeTreeView() ([]*NodeView, error) {
+	nodes, err := s.GetNodeTree()
+	if err != nil {
+		return nil, err
+	}
+	return toNodeViews(nodes), nil
+}
+
 // recountByGuid recomputes InboundCount/OnlineCount/DepletedCount for every node
 // in the tree, keyed by the GUID that physically hosts each inbound, so a direct
 // node shows only its own inbounds and each transitive node shows its own