Adds a transparent nginx passthrough that logs auth-related request
headers (Authorization, X-Emby-Authorization, X-Emby-Token,
X-MediaBrowser-Token, User-Agent) to diagnose why the Filebar iOS app
gets 400s on /Users/AuthenticateByName against Jellyfin 12.0. All
traffic still reaches the real jellyfin Service unchanged. Revert the
Ingress backend and remove jellyfin-header-debug.yaml once captured.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016EQrGkfXFae4PZG9QfPRf4
