Add Traefik reverse proxy configuration with Docker provider
Set up Traefik v3.2 with Docker label-based routing, Let's Encrypt SSL certificates, and configuration examples for multiple services including dashboard, Nextcloud, Portainer, and other applications. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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