Minimal Kanban-style workboard server using only Python stdlib + SQLite.

python3 server.py [--port PORT]

Opens at http://localhost:<port> (default: 8081).

• GET /api/columns — list columns
• GET /api/items — list items (optional ?column= filter)
• POST /api/columns — create/reorder columns
• POST /api/items — create item
• PUT /api/items/:id — update item
• DELETE /api/items/:id — soft delete (undoable)
• POST /api/undo_pop — restore last deleted item/column