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/[id]/index.put.ts

@@ -0,0 +1,72 @@
+/**
+ * PUT /api/webhooks/:id
+ * Update a webhook
+ */
+import { query } from '../../../utils/database'
+
+interface UpdateWebhookBody {
+  name?: string
+  url?: string
+  secret?: string
+  events?: string[]
+  instanceId?: string | null
+  isActive?: boolean
+}
+
+export default defineEventHandler(async (event) => {
+  const username = getHeader(event, 'x-authentik-username')
+  if (!username) {
+    throw createError({ statusCode: 401, message: 'Unauthorized' })
+  }
+
+  const id = getRouterParam(event, 'id')
+  const body = await readBody<UpdateWebhookBody>(event)
+
+  // Check if webhook exists
+  const existing = await query('SELECT id FROM webhooks WHERE id = $1', [id])
+  if (existing.rows.length === 0) {
+    throw createError({ statusCode: 404, message: 'Webhook not found' })
+  }
+
+  // Build update query dynamically
+  const updates: string[] = []
+  const values: any[] = []
+  let paramIndex = 1
+
+  if (body.name !== undefined) {
+    updates.push(`name = $${paramIndex++}`)
+    values.push(body.name)
+  }
+  if (body.url !== undefined) {
+    updates.push(`url = $${paramIndex++}`)
+    values.push(body.url)
+  }
+  if (body.secret !== undefined) {
+    updates.push(`secret = $${paramIndex++}`)
+    values.push(body.secret || null)
+  }
+  if (body.events !== undefined) {
+    updates.push(`events = $${paramIndex++}`)
+    values.push(body.events)
+  }
+  if (body.instanceId !== undefined) {
+    updates.push(`instance_id = $${paramIndex++}`)
+    values.push(body.instanceId || null)
+  }
+  if (body.isActive !== undefined) {
+    updates.push(`is_active = $${paramIndex++}`)
+    values.push(body.isActive)
+  }
+
+  if (updates.length === 0) {
+    throw createError({ statusCode: 400, message: 'No fields to update' })
+  }
+
+  values.push(id)
+  await query(
+    `UPDATE webhooks SET ${updates.join(', ')}, updated_at = NOW() WHERE id = $${paramIndex}`,
+    values
+  )
+
+  return { success: true }
+})