Phase 1: versioning, menu bar, About dialog, right-click context menu

- Directory.Build.props sets Version=0.1.0 (semver pre-1.0 = beta) plus
  Authors / Product / RepositoryUrl, picked up by all three projects.
- MainWindow gets a real menu bar (File / Server / Help) replacing the
  old toolbar. File: New endpoint / Import / Export / Backups (last
  three are stubs for the next phase) / Exit. Server: Settings /
  Restart service. Help: About.
- Drop the Refresh button - the 3 s polling loop covers it.
- DataGridRow gets a right-click context menu: Edit / Copy URL /
  toggle Enabled / Delete.
- New About dialog reads AssemblyInformationalVersion at runtime and
  links jpaul.me + the GitHub repo via clickable hyperlinks.
- Ctrl+N input binding for new-endpoint.

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

src/WebhookServer.Gui/MainWindow.xaml

@@ -8,6 +8,9 @@
         mc:Ignorable="d"
         Title="Webhook Server" Height="600" Width="1000"
         d:DataContext="{d:DesignInstance Type=vm:MainViewModel}">
+    <Window.InputBindings>
+        <KeyBinding Key="N" Modifiers="Control" Command="{Binding AddEndpointCommand}"/>
+    </Window.InputBindings>
     <DockPanel LastChildFill="True">
         <StatusBar DockPanel.Dock="Bottom">
             <StatusBarItem>
@@ -19,21 +22,25 @@
             </StatusBarItem>
         </StatusBar>
 
-        <ToolBar DockPanel.Dock="Top">
-            <Button Content="Refresh" Command="{Binding RefreshCommand}"/>
-            <Separator/>
-            <Button Content="Add" Command="{Binding AddEndpointCommand}"/>
-            <Button Content="Edit" Command="{Binding EditEndpointCommand}"
-                    IsEnabled="{Binding SelectedEndpoint, Converter={StaticResource NotNull}}"/>
-            <Button Content="Delete" Command="{Binding DeleteEndpointCommand}"
-                    IsEnabled="{Binding SelectedEndpoint, Converter={StaticResource NotNull}}"/>
-            <Separator/>
-            <Button Content="Copy URL" Command="{Binding CopyEndpointUrlCommand}"
-                    IsEnabled="{Binding SelectedEndpoint, Converter={StaticResource NotNull}}"
-                    ToolTip="Copy the full webhook URL for the selected endpoint to the clipboard"/>
-            <Separator/>
-            <Button Content="Server Settings…" Command="{Binding EditServerSettingsCommand}"/>
-        </ToolBar>
+        <Menu DockPanel.Dock="Top">
+            <MenuItem Header="_File">
+                <MenuItem Header="_New endpoint…" Command="{Binding AddEndpointCommand}" InputGestureText="Ctrl+N"/>
+                <Separator/>
+                <MenuItem Header="_Import config…" IsEnabled="False" ToolTip="Coming soon"/>
+                <MenuItem Header="_Export config…" IsEnabled="False" ToolTip="Coming soon"/>
+                <MenuItem Header="_Backups" IsEnabled="False" ToolTip="Coming soon"/>
+                <Separator/>
+                <MenuItem Header="E_xit" Command="{Binding ExitCommand}"/>
+            </MenuItem>
+            <MenuItem Header="_Server">
+                <MenuItem Header="_Settings…" Command="{Binding EditServerSettingsCommand}"/>
+                <Separator/>
+                <MenuItem Header="_Restart service" Command="{Binding RestartServiceCommand}"/>
+            </MenuItem>
+            <MenuItem Header="_Help">
+                <MenuItem Header="_About Webhook Server…" Command="{Binding ShowAboutCommand}"/>
+            </MenuItem>
+        </Menu>
 
         <Grid>
             <Grid.RowDefinitions>
@@ -53,6 +60,20 @@
                 <DataGrid.RowStyle>
                     <Style TargetType="DataGridRow">
                         <EventSetter Event="MouseDoubleClick" Handler="OnRowDoubleClick"/>
+                        <Setter Property="ContextMenu">
+                            <Setter.Value>
+                                <ContextMenu>
+                                    <MenuItem Header="_Edit…" Command="{Binding DataContext.EditEndpointCommand, RelativeSource={RelativeSource AncestorType=Window}}"/>
+                                    <MenuItem Header="_Copy URL" Command="{Binding DataContext.CopyEndpointUrlCommand, RelativeSource={RelativeSource AncestorType=Window}}"/>
+                                    <Separator/>
+                                    <MenuItem Header="Toggle _enabled"
+                                              Command="{Binding DataContext.ToggleEnabledCommand, RelativeSource={RelativeSource AncestorType=Window}}"
+                                              CommandParameter="{Binding}"/>
+                                    <Separator/>
+                                    <MenuItem Header="_Delete…" Command="{Binding DataContext.DeleteEndpointCommand, RelativeSource={RelativeSource AncestorType=Window}}"/>
+                                </ContextMenu>
+                            </Setter.Value>
+                        </Setter>
                     </Style>
                 </DataGrid.RowStyle>
                 <DataGrid.Columns>