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

app/pages/debug/index.vue

@@ -33,8 +33,11 @@
     </div>
 
     <!-- Tabs -->
-    <div v-if="selectedInstance" class="instance-card">
+    <div class="instance-card">
       <UTabs :items="tabs" class="w-full">
+        <template #webhooks>
+          <DebugWebhookReceiverSection />
+        </template>
         <template #blocklist>
           <DebugBlocklistSection
             :instance-id="selectedInstance?.value"
@@ -121,6 +124,7 @@ watch(instanceOptions, (opts) => {
 }, { immediate: true })
 
 const tabs = [
+  { label: 'Webhooks', slot: 'webhooks', icon: 'i-lucide-webhook' },
   { label: 'Blocklist', slot: 'blocklist', icon: 'i-lucide-ban' },
   { label: 'Privacy', slot: 'privacy', icon: 'i-lucide-shield' },
   { label: 'Groups', slot: 'groups', icon: 'i-lucide-users' },