Fix missing service registration for MediaSegments (#12392)

Emby.Server.Implementations/ApplicationHost.cs

@@ -40,6 +40,7 @@ using Jellyfin.MediaEncoding.Hls.Playlist;
 using Jellyfin.Networking.Manager;
 using Jellyfin.Networking.Udp;
 using Jellyfin.Server.Implementations;
+using Jellyfin.Server.Implementations.MediaSegments;
 using MediaBrowser.Common;
 using MediaBrowser.Common.Configuration;
 using MediaBrowser.Common.Events;
@@ -552,6 +553,8 @@ namespace Emby.Server.Implementations
             serviceCollection.AddScoped<DynamicHlsHelper>();
             serviceCollection.AddScoped<IClientEventLogger, ClientEventLogger>();
             serviceCollection.AddSingleton<IDirectoryService, DirectoryService>();
+
+            serviceCollection.AddSingleton<IMediaSegmentManager, MediaSegmentManager>();
         }
 
         /// <summary>