curl "https://api.chatgrid.ai/v1/boards/a1b2c3d4-e5f6-7890-abcd-ef1234567890/assets" \
  -H "Authorization: Bearer cgk_live_a1b2c3d4e5f6g7h8i9j0k1l2m3n4o5p6"

{
  "object": "list",
  "data": [
    {
      "id": "1711843260000-report.pdf",
      "url": "https://storage.chatgrid.ai/board-files/usr_123/brd_456/1711843260000-report.pdf",
      "filename": "1711843260000-report.pdf",
      "storage_path": "usr_123/brd_456/1711843260000-report.pdf",
      "size": 245760,
      "content_type": "application/pdf",
      "created_at": "2026-03-15T11:00:00.000Z"
    },
    {
      "id": "1711843300000-diagram.png",
      "url": "https://storage.chatgrid.ai/board-files/usr_123/brd_456/1711843300000-diagram.png",
      "filename": "1711843300000-diagram.png",
      "storage_path": "usr_123/brd_456/1711843300000-diagram.png",
      "size": 102400,
      "content_type": "image/png",
      "created_at": "2026-03-15T11:05:00.000Z"
    }
  ],
  "has_more": false,
  "cursor": null
}