dsh-notes-qiange: Add a paper sticky note board to DSH

dsh-notes-qiange (Qiange · Smart Notes) is a DSH note plugin maintained by jxhsjxhs, forked from @zzerx/dsh-plugin-notes 0.6.0 (MIT). It provides three entry points: the sidebar, the input box, and assistant replies; the note board can be opened in the middle column or the right sidebar. Notes are organized by project folders and support three views: paper card wall, Kanban, and calendar, featuring six-color pinning, search, archiving, Markdown task lists, and local image pasting. Notes can be dragged into five-column task swimlanes to be turned into tasks, assigned to AI in new sessions within a specified workspace, and executed either once or on a schedule; results are written back to the card and editor upon completion. Currently, entry points and WebDAV backup are configured in DSH Settings → Notes; it has not been published on npm and requires building from source for installation.