GUI UX, secret visibility, browser-friendly hooks, deploy script

GUI:
- URL column in endpoint grid + Copy URL toolbar button so the full
  http://host:port/hook/<slug> is one click away
- Double-click a row to open the edit dialog
- Bearer/HMAC sections in the editor hide when the auth mode doesn't
  use them, and reappear with previously-entered values when switched
  back
- Log panel auto-scroll checkbox (default on) plus 3s polling so log
  entries stream in without manual refresh
- Secret fields are now plain text with a Copy button. Anyone who can
  open the admin-pipe-ACL'd GUI is already SYSTEM-equivalent on the
  host, so masking the value just made recovery harder. PFX password
  in Server Settings gets the same treatment.

Service:
- Admin pipe ops log info-level lines on every mutation
  (create/update/delete/enable/disable/update-config/bind-https) so
  GUI activity is visible in the Serilog file
- /hook/{slug} accepts GET as well as POST so a browser smoke-test
  works without curl
- /favicon.ico returns 204 so browser hits don't pollute logs with 404s
- AdminPipeServer no longer strips plaintext secrets when sending
  config to the GUI; the pipe ACL already restricts to SYSTEM/Admins

Scripts:
- New deploy.ps1: stops + republishes + copies binaries to
  C:\Program Files\WebhookServer + (re)installs the Windows Service
- install-service.ps1 now uses sc.exe argv splatting consistently for
  both create and config paths

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

src/WebhookServer.Gui/MainWindow.xaml.cs

@@ -1,4 +1,6 @@
 using System.Windows;
+using System.Windows.Controls;
+using System.Windows.Input;
 using WebhookServer.Gui.Services;
 using WebhookServer.Gui.ViewModels;
 
@@ -13,4 +15,16 @@ public partial class MainWindow : Window
         DataContext = vm;
         Loaded += async (_, _) => await vm.RefreshCommand.ExecuteAsync(null);
     }
+
+    private void OnLogTailChanged(object sender, TextChangedEventArgs e)
+    {
+        if (DataContext is MainViewModel vm && vm.AutoScrollLogs && sender is TextBox box)
+            box.ScrollToEnd();
+    }
+
+    private void OnRowDoubleClick(object sender, MouseButtonEventArgs e)
+    {
+        if (DataContext is MainViewModel vm && vm.EditEndpointCommand.CanExecute(null))
+            vm.EditEndpointCommand.Execute(null);
+    }
 }