Initial commit: EngineeringSync v1.0.0

Vollständige Implementierung des EngineeringSync-Middleware-Tools:
- Windows Service (Kestrel :5050) mit FileSystemWatcher + SignalR
- WPF Tray-App mit PendingChanges- und Projektverwaltungs-Fenster
- Setup-Wizard (8-Schritte-Installer)
- SQLite/EF Core Datenschicht (WAL-Modus)
- SHA-256-basiertes Debouncing (2s Fenster)
- Backup-System mit konfigurierbarer Aufbewahrung

Bugfixes & Verbesserungen:
- BUG-1: AppDbContext OnConfiguring invertierte Bedingung behoben
- BUG-2: Event-Handler-Leak in TrayApp (Fenster-Singleton-Pattern)
- BUG-3: ProjectConfigChanged SignalR-Signal in allen CRUD-Endpoints
- BUG-5: Rename-Sync löscht alte Datei im Simulations-Ordner
- BUG-6: Doppeltes Dispose von SignalR verhindert
- BUG-7: Registry-Deinstallation nur EngineeringSync-Eintrag entfernt
- S1: Path-Traversal-Schutz via SafeCombine() im SyncManager
- E1: FSW Buffer 64KB + automatischer Re-Scan bei Overflow
- E2: Retry-Logik (3x) für gesperrte Dateien mit exponentiellem Backoff
- E4: Channel.Writer.TryComplete() beim Shutdown
- C2: HubMethodNames-Konstanten statt Magic Strings
- E3: Pagination in Changes-API (page/pageSize Query-Parameter)
- A1: Fire-and-Forget mit try/catch + Logging

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

EngineeringSync.Setup/Views/Pages/OptionCard.xaml.cs

@@ -0,0 +1,47 @@
+using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Media;
+
+namespace EngineeringSync.Setup.Views.Pages;
+
+public partial class OptionCard : UserControl
+{
+    public static readonly DependencyProperty IconProperty =
+        DependencyProperty.Register(nameof(Icon), typeof(string), typeof(OptionCard),
+            new PropertyMetadata(string.Empty, (d, e) => ((OptionCard)d).IconText.Text = (string)e.NewValue));
+
+    public static readonly DependencyProperty TitleProperty =
+        DependencyProperty.Register(nameof(Title), typeof(string), typeof(OptionCard),
+            new PropertyMetadata(string.Empty, (d, e) => ((OptionCard)d).TitleText.Text = (string)e.NewValue));
+
+    public static readonly DependencyProperty DescriptionProperty =
+        DependencyProperty.Register(nameof(Description), typeof(string), typeof(OptionCard),
+            new PropertyMetadata(string.Empty, (d, e) => ((OptionCard)d).DescText.Text = (string)e.NewValue));
+
+    public static readonly DependencyProperty IsCheckedProperty =
+        DependencyProperty.Register(nameof(IsChecked), typeof(bool), typeof(OptionCard),
+            new FrameworkPropertyMetadata(true,
+                FrameworkPropertyMetadataOptions.BindsTwoWayByDefault,
+                (d, e) => ((OptionCard)d).UpdateVisual((bool)e.NewValue)));
+
+    public string Icon        { get => (string)GetValue(IconProperty);  set => SetValue(IconProperty, value); }
+    public string Title       { get => (string)GetValue(TitleProperty); set => SetValue(TitleProperty, value); }
+    public string Description { get => (string)GetValue(DescriptionProperty); set => SetValue(DescriptionProperty, value); }
+    public bool   IsChecked   { get => (bool)GetValue(IsCheckedProperty);     set => SetValue(IsCheckedProperty, value); }
+
+    public OptionCard() => InitializeComponent();
+
+    private void Card_Click(object sender, RoutedEventArgs e) => IsChecked = !IsChecked;
+
+    private void UpdateVisual(bool isChecked)
+    {
+        if (ToggleBox is null) return;
+        ToggleBox.IsChecked = isChecked;
+        CardBorder.BorderBrush = isChecked
+            ? new SolidColorBrush(Color.FromRgb(0, 120, 212))
+            : new SolidColorBrush(Color.FromRgb(224, 224, 224));
+        CardBorder.Background = isChecked
+            ? new SolidColorBrush(Color.FromArgb(15, 0, 120, 212))
+            : new SolidColorBrush(Colors.White);
+    }
+}