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/events/stream.get.ts

@@ -0,0 +1,66 @@
+/**
+ * GET /api/events/stream
+ * Server-Sent Events endpoint for real-time updates
+ */
+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' })
+  }
+
+  // Set SSE headers
+  setHeader(event, 'Content-Type', 'text/event-stream')
+  setHeader(event, 'Cache-Control', 'no-cache')
+  setHeader(event, 'Connection', 'keep-alive')
+
+  // Get the raw response
+  const res = event.node.res
+
+  // Send initial connection message
+  res.write(`data: ${JSON.stringify({ type: 'connected', timestamp: Date.now() })}\n\n`)
+
+  // Event handlers
+  const handlers = {
+    'instance.status': (data: any) => {
+      res.write(`event: instance.status\ndata: ${JSON.stringify(data)}\n\n`)
+    },
+    'instance.qr': (data: any) => {
+      res.write(`event: instance.qr\ndata: ${JSON.stringify(data)}\n\n`)
+    },
+    'instance.pairing': (data: any) => {
+      res.write(`event: instance.pairing\ndata: ${JSON.stringify(data)}\n\n`)
+    },
+    'message.received': (data: any) => {
+      res.write(`event: message.received\ndata: ${JSON.stringify(data)}\n\n`)
+    },
+    'message.sent': (data: any) => {
+      res.write(`event: message.sent\ndata: ${JSON.stringify(data)}\n\n`)
+    },
+    'message.status': (data: any) => {
+      res.write(`event: message.status\ndata: ${JSON.stringify(data)}\n\n`)
+    }
+  }
+
+  // Register listeners
+  for (const [eventName, handler] of Object.entries(handlers)) {
+    baileysManager.on(eventName, handler)
+  }
+
+  // Keep-alive ping
+  const pingInterval = setInterval(() => {
+    res.write(`: ping\n\n`)
+  }, 30000)
+
+  // Cleanup on close
+  event.node.req.on('close', () => {
+    clearInterval(pingInterval)
+    for (const [eventName, handler] of Object.entries(handlers)) {
+      baileysManager.off(eventName, handler)
+    }
+  })
+
+  // Don't close the connection
+  return new Promise(() => {})
+})