Read board item filesystem file

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

{
  "path": "<string>",
  "name": "<string>",
  "mime_type": "<string>",
  "is_text": true,
  "size_bytes": 123,
  "truncated": true,
  "content": "<string>",
  "content_base64": "<string>"
}