초기 커밋: Phase 1 — 레지스트리 기반 컨텍스트 메뉴 + 핵심 변환 파이프라인

- Provider 추상화(IConverterProvider + ProviderCapability) — Available/RequiresExternal/ComingSoon 1급 시민
- 변환 구현: Magick(이미지·RAW·GIF·TIFF), HEIC/HEIF(libheif decode→Magick encode), PDF(PDFium), DOCX(Word COM 또는 LibreOffice 자동 감지)
- ComingSoon 스텁: HTML, HWP/HWPX (UI 노출, 컨텍스트 메뉴 등록 자동 제외)
- WPF + WPF-UI 4.3 Fluent 2 UI: 메인 창(드래그&드롭, Provider 카드), 변환 창(썸네일·옵션·진행률), 빠른 변환 진행 창, 진단 창
- 단일 EXE에 verb 라우팅: quick / dialog / register / unregister / diagnose / help
- HKCU SystemFileAssociations 기반 컨텍스트 메뉴 등록 (Win11 "추가 옵션 표시"에 노출)
- README, packaging/ Phase 2 placeholder 포함

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/EverythingToJpeg.App/App.xaml.cs

@@ -0,0 +1,100 @@
+using System.Windows;
+using EverythingToJpeg.App.Cli;
+using EverythingToJpeg.App.Views;
+using EverythingToJpeg.Core;
+
+namespace EverythingToJpeg.App;
+
+public partial class App : Application
+{
+    public ConversionEngine Engine { get; } = EverythingToJpegBootstrap.CreateDefault();
+
+    protected override async void OnStartup(StartupEventArgs e)
+    {
+        base.OnStartup(e);
+
+        var parsed = CliRouter.Parse(e.Args);
+
+        switch (parsed.Mode)
+        {
+            case CliRouter.Mode.Help:
+                ConsoleHelper.WriteLine(CliRouter.HelpText());
+                Environment.Exit(0);
+                return;
+
+            case CliRouter.Mode.Register:
+                Environment.Exit(CliRouter.RunRegister(register: true));
+                return;
+
+            case CliRouter.Mode.Unregister:
+                Environment.Exit(CliRouter.RunRegister(register: false));
+                return;
+
+            case CliRouter.Mode.Diagnose:
+                ShowDiagnoseWindow();
+                return;
+
+            case CliRouter.Mode.Quick:
+                if (parsed.Files.Count == 0)
+                {
+                    MessageBox.Show("변환할 파일이 없습니다.", "EverythingToJpeg",
+                        MessageBoxButton.OK, MessageBoxImage.Information);
+                    Shutdown(1);
+                    return;
+                }
+                await RunQuickAsync(parsed.Files);
+                return;
+
+            case CliRouter.Mode.Dialog:
+                ShowConvertDialog(parsed.Files);
+                return;
+
+            case CliRouter.Mode.ShowMain:
+            default:
+                ShowMainWindow();
+                return;
+        }
+    }
+
+    private void ShowMainWindow()
+    {
+        var window = new MainWindow();
+        MainWindow = window;
+        window.Show();
+    }
+
+    private void ShowConvertDialog(IReadOnlyList<string> files)
+    {
+        var window = new ConvertWindow(Engine, files);
+        MainWindow = window;
+        window.Show();
+    }
+
+    private void ShowDiagnoseWindow()
+    {
+        var window = new DiagnoseWindow(Engine);
+        MainWindow = window;
+        window.Show();
+    }
+
+    private async Task RunQuickAsync(IReadOnlyList<string> files)
+    {
+        var progress = new QuickProgressWindow(files.Count);
+        progress.Show();
+
+        try
+        {
+            var options = ConvertOptions.Quick();
+            var reporter = new Progress<ConvertProgress>(p => progress.Report(p));
+            var results = await Engine.ConvertManyAsync(files, options, reporter);
+            progress.Finish(results);
+        }
+        catch (Exception ex)
+        {
+            MessageBox.Show($"변환 중 오류: {ex.Message}", "EverythingToJpeg",
+                MessageBoxButton.OK, MessageBoxImage.Error);
+            progress.Close();
+            Shutdown(1);
+        }
+    }
+}