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/instances/[id]/index.delete.ts

@@ -0,0 +1,41 @@
+/**
+ * DELETE /api/instances/:id
+ * Delete an instance
+ */
+import { query } from '../../../utils/database'
+import { baileysManager } from '../../../services/baileys/manager'
+import { clearAuthState } from '../../../services/baileys/auth-state'
+
+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')
+
+  // Check if instance exists
+  const result = await query<{ id: string }>(
+    'SELECT id FROM instances WHERE id = $1',
+    [id]
+  )
+
+  if (result.rows.length === 0) {
+    throw createError({ statusCode: 404, message: 'Instance not found' })
+  }
+
+  // Disconnect if connected
+  try {
+    await baileysManager.disconnect(id!)
+  } catch (error) {
+    // Ignore disconnect errors
+  }
+
+  // Clear auth state
+  await clearAuthState(id!)
+
+  // Delete from database (cascades to related tables)
+  await query('DELETE FROM instances WHERE id = $1', [id])
+
+  return { success: true }
+})