Unified node CRUD on the folder-tree service

Unified node CRUD on the folder-tree service: a task in MiMo-V2.6-RL-harbor-code: MiMo-V2.6-RL Code (Harbor) (Harbor dataset). The folder-tree service holds the explorer's file/folder hierarchy in its state under folderTree.data . That value is a list of root-folder nodes; every node may carry a…