The PEM certificate content is already base64 encoded after removing
headers and newlines. We should not re-encode it.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Add sat-auth.service.ts for SAML token authentication with SAT
using FIEL credentials and SOAP protocol
- Add sat-download.service.ts with full download workflow:
- Request CFDI download (emitted/received)
- Verify request status with polling support
- Download ZIP packages when ready
- Helper functions for status checking
- Install fast-xml-parser and adm-zip dependencies
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
