Add initial implementations for encoder handling and conversion logic

Introduce encoder modules for various codecs and formats (e.g., h264_nvenc, libx264, libmp3lame). Add `Convertor` logic to retrieve supported formats via FFmpeg utilities and manage encoders for audio, video, and image processing.

internal/application/app.go

@@ -10,8 +10,9 @@ import (
 type AppContract interface {
 	FyneApp() fyne.App
 	GetSetting() setting.SettingContract
-	GetProgressBarService() ProgressBarContract
+	GetProgressBarService() convertor.ProgressBarContract
 	GetFFmpegService() ffmpeg.UtilitiesContract
+	GetConvertorService() convertor.ConvertorContract
 	GetItemsToConvert() convertor.ItemsToConvertContract
 	GetQueueService() convertor.QueueListContract
 	Run()
@@ -20,19 +21,21 @@ type AppContract interface {
 type application struct {
 	fyneApp            fyne.App
 	setting            setting.SettingContract
-	progressBarService ProgressBarContract
+	progressBarService convertor.ProgressBarContract
 	ffmpegService      ffmpeg.UtilitiesContract
 	itemsToConvert     convertor.ItemsToConvertContract
 	queueService       convertor.QueueListContract
+	convertorService   convertor.ConvertorContract
 }
 
 func NewApp(
 	fyneApp fyne.App,
 	setting setting.SettingContract,
-	progressBarService ProgressBarContract,
+	progressBarService convertor.ProgressBarContract,
 	ffmpegService ffmpeg.UtilitiesContract,
 	itemsToConvert convertor.ItemsToConvertContract,
 	queueService convertor.QueueListContract,
+	convertorService convertor.ConvertorContract,
 ) AppContract {
 	return &application{
 		fyneApp:            fyneApp,
@@ -41,6 +44,7 @@ func NewApp(
 		ffmpegService:      ffmpegService,
 		itemsToConvert:     itemsToConvert,
 		queueService:       queueService,
+		convertorService:   convertorService,
 	}
 }
 
@@ -52,7 +56,7 @@ func (a *application) GetSetting() setting.SettingContract {
 	return a.setting
 }
 
-func (a *application) GetProgressBarService() ProgressBarContract {
+func (a *application) GetProgressBarService() convertor.ProgressBarContract {
 	return a.progressBarService
 }
 
@@ -68,6 +72,10 @@ func (a *application) GetQueueService() convertor.QueueListContract {
 	return a.queueService
 }
 
+func (a *application) GetConvertorService() convertor.ConvertorContract {
+	return a.convertorService
+}
+
 func (a *application) Run() {
 	a.fyneApp.Run()
 }