Add -stats flag to preserve progress updates with custom log level

- FFmpeg suppresses progress output (fps, time, bitrate) when loglevel is set to error
- Add -stats flag to force progress updates regardless of log level
- Fixes dashboard not showing transcode info (codec, progress, etc.)

MediaBrowser.Controller/MediaEncoding/EncodingHelper.cs

@@ -7110,7 +7110,7 @@ namespace MediaBrowser.Controller.MediaEncoding
             // Apply FFmpeg log level from configuration
             if (!string.IsNullOrEmpty(encodingOptions.FfmpegLogLevel))
             {
-                inputModifier = $"-loglevel {encodingOptions.FfmpegLogLevel}";
+                inputModifier = $"-loglevel {encodingOptions.FfmpegLogLevel} -stats";
             }
 
             var analyzeDurationArgument = string.Empty;