Get OCR job status

{
  "id": "ocr_abc123",
  "status": "completed",
  "page_count": 15,
  "metadata": {
    "confidence": 0.95,
    "language": "en"
  },
  "created_at": "2024-01-15T10:30:00Z",
  "completed_at": "2024-01-15T10:32:15Z"
}