Feature: Receptor de webhooks interno para debug

- Endpoint POST /api/debug/webhook-receiver para recibir webhooks
- Almacenamiento en memoria de ultimos 100 eventos
- Endpoint GET/DELETE para consultar/limpiar eventos
- Nueva tab Webhooks en seccion Debug con polling cada 5s

server/api/debug/webhook-events.get.ts

@@ -0,0 +1,23 @@
+/**
+ * GET /api/debug/webhook-events
+ * Get stored debug webhook events
+ */
+import { debugWebhookStore } from '../../services/debug/webhook-store'
+
+export default defineEventHandler(async (event) => {
+  const username = getHeader(event, 'x-authentik-username')
+  if (!username) {
+    throw createError({ statusCode: 401, message: 'Unauthorized' })
+  }
+
+  const query = getQuery(event)
+  const limit = parseInt(query.limit as string) || 50
+
+  const events = debugWebhookStore.getEvents(limit)
+
+  return {
+    success: true,
+    count: events.length,
+    events
+  }
+})