fix(components): serialize SSE progress streaming via Channel and fix premature termination race condition - #79

Possible null reference argument for parameter 'ModelName' in 'DiffusionFitRequest.DiffusionFitRequest(string ModelName = "Flux.1 Dev", string Quantization = "FP8", int Resolution = 1024, long AvailableVramMb = 16384, long AvailableRamMb = 32768)'.

Possible null reference argument for parameter 'ModelName' in 'VideoFitRequest.VideoFitRequest(string ModelName = "Wan 2.2 14B", string Quantization = "FP8", int FrameCount = 49, int Resolution = 720, long AvailableVramMb = 16384, long AvailableRamMb = 32768)'.

Possible null reference argument for parameter 'modelName' in 'ThreeDFitResult CanIRunItService.Evaluate3DFit(string modelName, long vramMb, long ramMb)'.

Possible null reference argument for parameter 'engineName' in 'AudioFitResult CanIRunItService.EvaluateAudioFit(string engineName, long vramMb, long ramMb)'.

Possible null reference argument for parameter 'ModelName' in 'ThreeDFitResult.ThreeDFitResult(string ModelName, long VramRequiredMb, long RamRequiredMb, FitVerdict FitVerdict, double EstimatedSecondsPerMesh, string RecommendationMessage)'.

Possible null reference argument for parameter 'EngineName' in 'AudioFitResult.AudioFitResult(string EngineName, long VramRequiredMb, long RamRequiredMb, FitVerdict FitVerdict, double EstimatedRealtimeFactor, string RecommendationMessage)'.

Possible null reference argument for parameter 'ModelName' in 'VideoFitResult.VideoFitResult(string ModelName, long DiTModelMb, long FrameContextMb, long VaeDecodeMb, long TotalVramMb, long TotalRamMb, FitVerdict FitVerdict, double EstimatedSecondsPerFrame, string RecommendationMessage)'.

Possible null reference argument for parameter 'ModelName' in 'DiffusionFitResult.DiffusionFitResult(string ModelName, long BaseModelMb, long EncodersMb, long VaeMb, long LatentBufferMb, long TotalVramMb, long TotalRamMb, FitVerdict FitVerdict, double EstimatedSecondsPerImage, string RecommendationMessage)'.

'Bitmap.Save(Stream, int?)' is obsolete: 'Use the overload accepting BitmapEncoderOptions instead.'

Possible null reference argument for parameter 'source' in 'string? Enumerable.FirstOrDefault<string>(IEnumerable<string> source)'.