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>

docker/docker-compose.whatsapp.yml

@@ -0,0 +1,16 @@
+services:
+  wppconnect:
+    image: wppconnect/server:latest
+    container_name: wppconnect
+    restart: always
+    network_mode: host
+    environment:
+      - HOST=0.0.0.0
+      - PORT=21465
+      - SECRET_KEY=nexus-wpp-secret-2026
+      - LOG_LEVEL=info
+    volumes:
+      - wpp_tokens:/home/node/app/tokens
+
+volumes:
+  wpp_tokens: