- Add FileResponse interface and FORMAT_MIME map to service
- Implement convertCert: parses any input format (PEM/DER/PFX/P7B) via
same logic as parseCert; serializes to pem/der/p7b targetFormat
- DER output uses bytesToHex→Buffer.from(hex,'hex') to avoid utf-8
corruption (Pitfall 1 / T-09-06)
- P7B output: pkcs7.createSignedData + pem.encode (PEM-wrapped PKCS7)
- Wrap all forge ops in try/catch → BadRequestException (T-09-01)
- Controller: add @Body('pemText') + reject when neither file nor pemText
- Fix: re-add NotImplementedException import for mergeCerts stub
- All 23 API cert-manager tests green (including 4 new convertCert)
- splitCerts fullchain PEM: expects count 2, two single-PEM-block certs with correct CN
- splitCerts P7B PEM bundle: expects at least one cert in result
- splitCerts malformed input: expects BadRequestException
- All three tests FAIL against NotImplementedException stub (RED confirmed)
- All 16 prior tests still pass
- Added parseCert describe block with 5 failing tests
- Covers PEM input, DER input, PFX+correct-password, PFX+wrong-password (BadRequestException), malformed input (BadRequestException)
- Existing 11 helper tests still pass
- Fixtures built via node-forge (RSA-1024, DER from asn1.toDer, PFX via toPkcs12Asn1)
schalli