Add 3 custom shortcut bar CRUD subcommands and update skill docs.
- toolbar_create_custom.go: create custom entry with extension parsing
and org-id-list support (write/medium, not_idempotent)
- toolbar_remove_custom.go: delete custom entry with --yes confirmation
gate (write/medium, confirmation required)
- toolbar_update_custom.go: update custom entry with same parameter set
as create-custom plus shortcut-id (write/medium)
- chat.md: add toolbar command group documentation with all 7 subcommands
长真
ae426f37de