CAMBS, RMI, CONSENSIO, and INLAND always export TIFs into the daily date
folder instead of PDFs, so engine.ps1's hardcoded "*.pdf" filter silently
found nothing to upload (no error, just "No PDFs" for every practice).
Added optional entity.json field "insurance_file_type" (defaults to "pdf"
when omitted, so existing entities are unaffected); the PT STMT split logic
already worked on filename regardless of extension, so no other changes
needed.