Comprehensive docs pass reflecting the new Fly proxy architecture:
- Fly proxy routes through Caddy on indri (not per-service TS Ingress)
- Direct WireGuard peering via --port=41641 pinning
- DERP relay performance lesson in Tailscale docs
- Caddy now in public traffic path
- indri tagged as flyio-target
- Removed fly-reload references
- Updated architecture diagrams and per-service setup guide
- Added changelog fragment
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>