Add filename .pdf extension fallback and %PDF magic bytes validation to
extractManual controller. Update getJobStatus to return 410 Gone for
expired jobs. Add 16 unit tests covering all acceptance criteria.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Add POST /api/ocr/extract/manual endpoint that proxies to the Python
OCR service's manual extraction pipeline. Includes Pro tier gating via
document.scanMaintenanceSchedule, PDF-only validation, 200MB file size
limit, and async 202 job response for polling via existing job status
endpoint.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>