- Add sat-crypto.service.ts with AES-256-GCM encryption for secure
credential storage using JWT_SECRET as key derivation source
- Add fiel.service.ts with complete FIEL lifecycle management:
- Upload and validate FIEL credentials (.cer/.key files)
- Verify certificate is FIEL (not CSD) and not expired
- Store encrypted credentials in database
- Retrieve and decrypt credentials for SAT sync operations
- Install @nodecfdi/credentials for FIEL/CSD handling
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>