Unarchive board item

curl --request POST \
  --url https://api.wacht.dev/ai/actor-projects/{project_id}/board/items/{item_id}/unarchive \
  --header 'Authorization: <api-key>'

{
  "id": "<string>",
  "board_id": "<string>",
  "task_key": "<string>",
  "title": "<string>",
  "description": "<string>",
  "status": "<string>",
  "priority": "<string>",
  "assigned_thread_id": "<string>",
  "metadata": {},
  "completed_at": "2023-11-07T05:31:56Z",
  "archived_at": "2023-11-07T05:31:56Z",
  "created_at": "2023-11-07T05:31:56Z",
  "updated_at": "2023-11-07T05:31:56Z"
}