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]/connect.post.ts

@@ -0,0 +1,54 @@
+/**
+ * POST /api/instances/:id/connect
+ * Connect an instance (generates QR code)
+ */
+import { query } from '../../../utils/database'
+import { baileysManager } from '../../../services/baileys/manager'
+
+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; status: string }>(
+    'SELECT id, status FROM instances WHERE id = $1',
+    [id]
+  )
+
+  if (result.rows.length === 0) {
+    throw createError({ statusCode: 404, message: 'Instance not found' })
+  }
+
+  const instance = result.rows[0]
+
+  // Don't connect if already connected
+  if (instance.status === 'connected') {
+    throw createError({ statusCode: 400, message: 'Instance already connected' })
+  }
+
+  // Start connection
+  try {
+    await baileysManager.connect(id!)
+
+    // Wait a bit for QR to generate
+    await new Promise(resolve => setTimeout(resolve, 2000))
+
+    const qrCode = baileysManager.getQRCode(id!)
+    const status = baileysManager.getStatus(id!)
+
+    return {
+      success: true,
+      status: status?.status || 'connecting',
+      qrCode
+    }
+  } catch (error) {
+    throw createError({
+      statusCode: 500,
+      message: `Failed to connect: ${(error as Error).message}`
+    })
+  }
+})