do not resolve media paths with route resolver

zero.Core/Media/MediaFileSystem.cs

@@ -20,7 +20,20 @@ public class MediaFileSystem : PhysicalFileSystem, IMediaFileSystem
     }
     return PublicPathPrefix + path.TrimStart('/');
   }
+
+
+  /// <inheritdoc />
+  public bool IsMediaPath(string path)
+  {
+    return path.StartsWith(PublicPathPrefix, StringComparison.InvariantCultureIgnoreCase);
+  }
 }
 
 
-public interface IMediaFileSystem : IFileSystem { }
+public interface IMediaFileSystem : IFileSystem
+{
+  /// <summary>
+  /// Determine whether the given path is part of the media file system
+  /// </summary>
+  bool IsMediaPath(string path);
+}