feat: Fork octo-fiestarr as allstarr with Jellyfin proxy improvements

Major changes:
- Rename project from octo-fiesta to allstarr
- Add Jellyfin proxy support alongside Subsonic/Navidrome
- Implement fuzzy search with relevance scoring and Levenshtein distance
- Add POST body logging for debugging playback progress issues
- Separate local and external artists in search results
- Add +5 score boost for external results to prioritize larger catalog(probably gonna reverse it)
- Create FuzzyMatcher utility for intelligent search result scoring
- Add ConvertPlaylistToJellyfinItem method for playlist support
- Rename keys folder to apis and update gitignore
- Filter search results by relevance score (>= 40)
- Add Redis caching support with configurable settings
- Update environment configuration with backend selection
- Improve external provider integration (SquidWTF, Deezer, Qobuz)
- Add tests for all services

.gitignore

@@ -68,7 +68,19 @@ obj/
 # Autres fichiers temporaires
 *.log
 
-/.env
-
-# Downloaded music files
-octo-fiesta/downloads/
+/.env
+
+# Downloaded music files
+downloads/
+!downloads/.gitkeep
+
+# Docker volumes
+redis-data/
+
+# API keys and specs (ignore markdown docs, keep OpenAPI spec)
+apis/*.md
+apis/*.json
+!apis/jellyfin-openapi-stable.json
+
+# Original source code for reference
+originals/