Refactor of plugin structure to make more sense compared to the default template

Jellyfin.Plugin.MediaCleaner/Helpers/MovieHelper.cs

@@ -1,8 +1,6 @@
 using System;
 using System.Linq;
-using System.Threading;
 using Jellyfin.Database.Implementations.Entities;
-using Jellyfin.Plugin.MediaCleaner.Configuration;
 using MediaBrowser.Controller.Entities;
 using Microsoft.Extensions.Logging;
 
@@ -12,7 +10,7 @@ public class MovieHelper(ILogger logger)
 {
     private readonly LoggingHelper _loggingHelper = new(logger);
 
-    private static PluginConfiguration Configuration =>
+    private static Configuration Configuration =>
         Plugin.Instance!.Configuration;
 
     public bool IsMovieStale(BaseItem movie)