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

allstarr/Models/Download/DownloadInfo.cs

@@ -0,0 +1,17 @@
+namespace allstarr.Models.Download;
+
+/// <summary>
+/// Information about an ongoing or completed download
+/// </summary>
+public class DownloadInfo
+{
+    public string SongId { get; set; } = string.Empty;
+    public string ExternalId { get; set; } = string.Empty;
+    public string ExternalProvider { get; set; } = string.Empty;
+    public DownloadStatus Status { get; set; }
+    public double Progress { get; set; } // 0.0 to 1.0
+    public string? LocalPath { get; set; }
+    public string? ErrorMessage { get; set; }
+    public DateTime StartedAt { get; set; }
+    public DateTime? CompletedAt { get; set; }
+}

allstarr/Models/Download/DownloadStatus.cs

@@ -0,0 +1,12 @@
+namespace allstarr.Models.Download;
+
+/// <summary>
+/// Download status of a song
+/// </summary>
+public enum DownloadStatus
+{
+    NotStarted,
+    InProgress,
+    Completed,
+    Failed
+}