feat: implement DeezerDownloadService with Blowfish decryption

- Port JavaScript DeezerDownloader to C#
- Add Deezer API authentication with ARL token
- Implement track download via media.deezer.com API
- Add Blowfish CBC decryption for encrypted chunks (uses OpenSSL)
- Add rate limiting and retry with exponential backoff
- Update config for Deezer ARL tokens
- Configure Subsonic URL to 192.168.1.12:4533

octo-fiesta/Models/SubsonicSettings.cs

@@ -1,6 +1,6 @@
-namespace octo_fiesta.Models;
-
-public class SubsonicSettings
-{
-        public string? Url { get; set; }
+namespace octo_fiesta.Models;
+
+public class SubsonicSettings
+{
+        public string? Url { get; set; }
 }