Initial commit: sap-webhook-api

API NestJS que recibe el Webhook Messenger de SAP Business One
(CloudEvents), valida HMAC opcional y guarda cada notificacion
local (data/events/) e inserta en Postgres (webhook_events).

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,7 @@
+node_modules
+dist
+coverage
+.env
+certs/*.pem
+data/events/*.json
+.DS_Store