Document Setup Keys concept vs SSO, PAT creation and usage, and the
workaround for renaming a setup key — the API silently ignores the
name field on PUT, so the fix is to UPDATE store.db directly and
restart netbird-server.
Document the fix for 'server closed the stream without sending trailers'
gRPC error when exposing NetBird via Nginx Proxy Manager:
- NPM proxy_host advanced_config with grpc_pass for Signal/Management
- Caddy h2c listener enabled via 'protocols h1 h2 h2c'
