Get User Flash Bookmarks

curl --request GET \
  --url http://localhost:3000/api/flash/bookmarks/user

{
  "bookmarks": [
    {
      "id": "<string>",
      "userId": "<string>",
      "flashId": "<string>",
      "artistId": "<string>",
      "createdAt": 123,
      "notes": "<string>",
      "customTags": [
        "<string>"
      ]
    }
  ]
}