feat: WhatsApp Nucleo con Nuxt 4 + Baileys v7

Reemplazo completo de Evolution API por implementación directa con Baileys.

Características:
- Dashboard completo con Nuxt UI v4
- Soporte para múltiples instancias de WhatsApp
- Conexión via QR code o pairing code
- Persistencia de mensajes en PostgreSQL
- API REST para integraciones externas
- Webhooks con firma HMAC
- SSE para actualizaciones en tiempo real
- Autenticación con Authentik

server/api/webhooks/index.get.ts

@@ -0,0 +1,40 @@
+/**
+ * GET /api/webhooks
+ * List all webhooks
+ */
+import { query } from '../../utils/database'
+
+interface WebhookRow {
+  id: string
+  name: string
+  url: string
+  events: string[]
+  is_active: boolean
+  instance_id: string | null
+  created_at: Date
+}
+
+export default defineEventHandler(async (event) => {
+  const username = getHeader(event, 'x-authentik-username')
+  if (!username) {
+    throw createError({ statusCode: 401, message: 'Unauthorized' })
+  }
+
+  const result = await query<WebhookRow>(
+    `SELECT w.id, w.name, w.url, w.events, w.is_active, w.instance_id, w.created_at,
+            i.name as instance_name
+     FROM webhooks w
+     LEFT JOIN instances i ON w.instance_id = i.id
+     ORDER BY w.created_at DESC`
+  )
+
+  return result.rows.map(row => ({
+    id: row.id,
+    name: row.name,
+    url: row.url,
+    events: row.events,
+    isActive: row.is_active,
+    instanceId: row.instance_id,
+    createdAt: row.created_at
+  }))
+})