Initial commit: sap-legacy-webhook-emulator

Reconstruye el Webhook Messenger nativo de SAP B1 (FP2605) para
clientes que aun no estan en esa version: captura eventos via
SBO_SP_PostTransactionNotice, provisiona UserTables OEVC/EVC1/OEVN/EVN1
y despacha CloudEvents al mismo endpoint que el messenger real.

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

json/subscriptions/oevc-test-local.json

@@ -0,0 +1,10 @@
+{
+  "_comment": "POST /U_OEVC — suscripción de prueba, apunta al listener HTTP local levantado para esta prueba (scripts/_tmp-fake-webhook-receiver.ts). Equivalente a: npx tsx scripts/manage-subscriptions.ts subscription:add TEST_LOCAL http://127.0.0.1:4100/webhooks/sap",
+  "Code": "TEST_LOCAL",
+  "Name": "TEST_LOCAL",
+  "U_WebhookURL": "http://127.0.0.1:4100/webhooks/sap",
+  "U_AuthType": "N",
+  "U_AuthCred": null,
+  "U_State": "A",
+  "U_WorkMode": "S"
+}