refactor(ui): "Nach Updates suchen" ins Hilfe-Menue verschieben

MinVer setzt die AssemblyVersion auf {Major}.0.0.0 (Binding-Kompatibilitaet),
darum zeigte der Dialog immer "2.0.0". Die echte Major.Minor.Patch steckt in
der FileVersion.

src/ClaudeDo.Ui/ViewModels/Modals/AboutModalViewModel.cs

@@ -1,3 +1,5 @@
+using System;
+using System.Diagnostics;
 using System.IO;
 using System.Reflection;
 using ClaudeDo.Data;
@@ -10,8 +12,14 @@ namespace ClaudeDo.Ui.ViewModels.Modals;
 
 public sealed partial class AboutModalViewModel : ViewModelBase
 {
+    // MinVer sets AssemblyVersion to {Major}.0.0.0 for binding compat — Assembly.GetName().Version
+    // shows "2.0.0" no matter the release. FileVersion carries the real Major.Minor.Patch.
     public string AppVersion { get; } =
-        Assembly.GetExecutingAssembly().GetName().Version?.ToString(3) ?? "0.0.0";
+        Version.TryParse(
+            FileVersionInfo.GetVersionInfo(Assembly.GetExecutingAssembly().Location).FileVersion,
+            out var version)
+            ? version.ToString(3)
+            : "0.0.0";
     public string DataFolderPath { get; } = Paths.AppDataRoot();
     public string LogsFolderPath { get; } = Path.Combine(Paths.AppDataRoot(), "logs");
     public string WorkerConfigPath { get; } = Path.Combine(Paths.AppDataRoot(), "worker.config.json");

src/ClaudeDo.Ui/Views/MainWindow.axaml

@@ -64,8 +64,6 @@
                       Foreground="{DynamicResource TextDimBrush}">
               <MenuItem Header="{loc:Tr shell.menu.restartWorker}"
                         Command="{Binding RestartWorkerCommand}"/>
-              <MenuItem Header="{loc:Tr shell.menu.checkForUpdates}"
-                        Command="{Binding CheckForUpdatesCommand}"/>
               <MenuItem Header="{loc:Tr shell.menu.usageMonitor}"
                         Command="{Binding OpenUsageMonitorCommand}"/>
             </MenuItem>
@@ -79,6 +77,8 @@
             <MenuItem Header="{loc:Tr shell.menu.help}"
                       FontSize="{StaticResource FontSizeMono}"
                       Foreground="{DynamicResource TextDimBrush}">
+              <MenuItem Header="{loc:Tr shell.menu.checkForUpdates}"
+                        Command="{Binding CheckForUpdatesCommand}"/>
               <MenuItem Header="{loc:Tr shell.menu.weeklyReport}" Command="{Binding OpenWeeklyReportCommand}"/>
               <MenuItem Header="{loc:Tr shell.menu.about}" Command="{Binding OpenAboutCommand}"/>
             </MenuItem>