Add Docker deployment support for Dokploy

- Add Dockerfile with multi-stage build
- Add docker-compose.yml with Traefik labels
- Add .dockerignore for optimal build context
- Update next.config.ts for standalone output
- Update DEPLOYMENT.md with Dokploy instructions

Co-Authored-By: Claude <noreply@anthropic.com>

docker-compose.yml

@@ -0,0 +1,23 @@
+services:
+  brachnha-insights:
+    build:
+      context: .
+      dockerfile: Dockerfile
+    container_name: brachnha-insights
+    restart: unless-stopped
+    ports:
+      - "3000:3000"
+    environment:
+      - NODE_ENV=production
+    networks:
+      - dokploy-network
+    labels:
+      - "traefik.enable=true"
+      - "traefik.http.routers.brachnha-insights.rule=Host(`your-domain.com`)"
+      - "traefik.http.routers.brachnha-insights.tls=true"
+      - "traefik.http.routers.brachnha-insights.tls.certresolver=letsencrypt"
+      - "traefik.http.services.brachnha-insights.loadbalancer.server.port=3000"
+
+networks:
+  dokploy-network:
+    external: true