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.post.ts

@@ -0,0 +1,54 @@
+/**
+ * POST /api/webhooks
+ * Create a webhook
+ */
+import { query } from '../../utils/database'
+
+interface CreateWebhookBody {
+  name: string
+  url: string
+  secret?: string
+  events: string[]
+  instanceId?: string | null
+}
+
+export default defineEventHandler(async (event) => {
+  const username = getHeader(event, 'x-authentik-username')
+  if (!username) {
+    throw createError({ statusCode: 401, message: 'Unauthorized' })
+  }
+
+  const body = await readBody<CreateWebhookBody>(event)
+
+  if (!body.name?.trim()) {
+    throw createError({ statusCode: 400, message: 'Name is required' })
+  }
+  if (!body.url?.trim()) {
+    throw createError({ statusCode: 400, message: 'URL is required' })
+  }
+  if (!body.events?.length) {
+    throw createError({ statusCode: 400, message: 'At least one event is required' })
+  }
+
+  const result = await query<{ id: string }>(
+    `INSERT INTO webhooks (name, url, secret, events, instance_id, created_by)
+     VALUES ($1, $2, $3, $4, $5, $6)
+     RETURNING id`,
+    [
+      body.name.trim(),
+      body.url.trim(),
+      body.secret || null,
+      body.events,
+      body.instanceId || null,
+      username
+    ]
+  )
+
+  return {
+    id: result.rows[0].id,
+    name: body.name,
+    url: body.url,
+    events: body.events,
+    instanceId: body.instanceId || null
+  }
+})