`/api/health` and `/api/certificate-status` reported the cert as
available when `NEXT_PRIVATE_SIGNING_TRANSPORT` was unset, even though
sealing defaults to the local P12 and fails if it is missing,
unreadable, or expired.
Migrate from @documenso/pdf-sign and @cantoo/pdf-lib to @libpdf/core
for all PDF manipulation and signing operations. This includes:
- New signing transports for Google Cloud KMS and local certificates
- Consolidated PDF operations using libpdf API
- Added TSA (timestamp authority) helper for digital signatures
- Removed deprecated flatten and insert utilities
- Updated tests to use new PDF library
Ephraim Duncan
Nathan Delhaye
Catalin Pit
David Nguyen
Lucas Smith
Ephraim Atta-Duncan
Timur Ercan