- Backend: include api_rates (per-service calls/min + Spotify endpoints)
and spotify_rate_limit (active, remaining, trigger endpoint) in debug-info
- Frontend: format API rates table with service name, cpm, limit, percentage,
and Spotify endpoint breakdown. Show bold warning block when rate limited
with trigger endpoint, remaining time, and retry-after value
- Overview and setup sections now list all 6 download sources
- Services table adds HiFi (no auth) and Deezer (ARL token)
- Enhanced Search documents multi-source tabs (Spotify/iTunes/Deezer)
- Download Sources table adds HiFi and Deezer rows
- Post-processing explains AcoustID skip for streaming sources and
the new artist/title verification for streaming candidates
- File Organization documents $albumtype, $disc, and all template vars
- Quality Profiles adds callout for per-source fallback toggle
- Settings credentials list adds HiFi and Deezer entries
