feat: WhatsApp bridge con Baileys directo — QR funcional

Reemplaza Evolution API con bridge Node.js propio usando Baileys.
QR se genera en ~10 segundos. Auto-reply con chatbot IA.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

pos/whatsapp-bridge-package.json

@@ -0,0 +1,11 @@
+{
+  "name": "nexus-whatsapp-bridge",
+  "version": "1.0.0",
+  "type": "commonjs",
+  "dependencies": {
+    "@whiskeysockets/baileys": "^6.7.16",
+    "express": "^4.18.2",
+    "qrcode": "^1.5.3",
+    "pino": "^8.16.2"
+  }
+}