v1.2.1: MusicBrainz genre enrichment + cleanup

## Features
- Implement automatic MusicBrainz genre enrichment for all external sources
  - Deezer: Enriches when genre missing
  - Qobuz: Enriches when genre missing
  - SquidWTF/Tidal: Always enriches (Tidal doesn't provide genres)
- Use ISRC codes for exact matching, fallback to title/artist search
- Cache results in Redis (30 days) + file cache for performance
- Respect MusicBrainz rate limits (1 req/sec)

## Cleanup
- Remove unused Spotify API ClientId and ClientSecret settings
- Simplify Spotify API configuration

This ensures all external tracks have genre metadata for better
organization and filtering in music clients.

docker-compose.yml

@@ -12,22 +12,6 @@ services:
       interval: 10s
       timeout: 3s
       retries: 3
-<<<<<<< HEAD
-    volumes:
-      - ${REDIS_DATA_PATH:-./redis-data}:/data
-    networks:
-      - allstarr-network
-
-  spotify-lyrics:
-    image: akashrchandran/spotify-lyrics-api:latest
-    container_name: allstarr-spotify-lyrics
-    restart: unless-stopped
-    ports:
-      - "8365:8080"
-    environment:
-      - SP_DC=${SPOTIFY_API_SESSION_COOKIE:-}
-||||||| bc4e5d9
-=======
     volumes:
       - ${REDIS_DATA_PATH:-./redis-data}:/data
     networks:
@@ -44,7 +28,6 @@ services:
       - "8365:8080"
     environment:
       - SP_DC=${SPOTIFY_API_SESSION_COOKIE:-}
->>>>>>> dev
     networks:
       - allstarr-network
 
@@ -124,8 +107,6 @@ services:
       
       # ===== SPOTIFY DIRECT API (for lyrics, ISRC matching, track ordering) =====
       - SpotifyApi__Enabled=${SPOTIFY_API_ENABLED:-false}
-      - SpotifyApi__ClientId=${SPOTIFY_API_CLIENT_ID:-}
-      - SpotifyApi__ClientSecret=${SPOTIFY_API_CLIENT_SECRET:-}
       - SpotifyApi__SessionCookie=${SPOTIFY_API_SESSION_COOKIE:-}
       - SpotifyApi__SessionCookieSetDate=${SPOTIFY_API_SESSION_COOKIE_SET_DATE:-}
       - SpotifyApi__CacheDurationMinutes=${SPOTIFY_API_CACHE_DURATION_MINUTES:-60}