kappa 4b3e1a0baf docs: Update PROJECT_DOCUMENTATION.md with Podman + Quadlet automation
Complete rewrite of project documentation focusing on Podman containerization
and systemd-based auto-start using Quadlet. Key improvements:

- Replace Cloudflare R2 log streaming with container automation
- Add comprehensive kernel tuning for production workloads
- Implement rootless container with privileged port binding
- Document complete auto-start system with 40-second boot time
- Include troubleshooting, security considerations, and operations guide
- Validate all configurations through reboot testing

System: Debian 13 (Trixie) + Podman 5.4.2 + Quadlet + systemd
Ports: 80 (HTTP), 81 (Admin UI), 443 (HTTPS)
Auto-start:  Verified with full reboot test

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>
2025-09-11 10:17:40 +09:00
Description
Nginx Proxy Manager configuration
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