[GAP-006,007] feat: Add Digital Signatures and Audit Change Log
GAP-006: Digital Signatures (3 SP)
- digital-signature.entity.ts: Firma simple/avanzada/cualificada
- digital-signature.service.ts: Request, sign, reject, revoke, validate
- digital-signature.controller.ts: REST endpoints
GAP-007: Audit Change Log (5 SP)
- change-log.entity.ts: Registro de cambios via triggers
- change-log.service.ts: Queries, history, statistics
- change-log.controller.ts: REST endpoints
Routes registered in server.ts:
- /api/v1/digital-signatures
- /api/v1/change-log
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
2caa489093