Delete vault object

curl --request DELETE \
  --url https://api.case.dev/vault/{id}/objects/{objectId} \
  --header 'Authorization: Bearer <token>'

{
  "success": true,
  "deletedObject": {
    "id": "obj_abc123",
    "filename": "contract.pdf",
    "sizeBytes": 1024000,
    "vectorsDeleted": 28
  }
}