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>

tsconfig.build.json

@@ -0,0 +1,4 @@
+{
+  "extends": "./tsconfig.json",
+  "exclude": ["node_modules", "test", "dist", "**/*spec.ts"]
+}