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/ViewModels/EndpointEditorViewModel.cs

@@ -1,5 +1,6 @@
 using System.Runtime.Versioning;
 using System.Text.Json;
+using System.Windows;
 using CommunityToolkit.Mvvm.ComponentModel;
 using CommunityToolkit.Mvvm.Input;
 using WebhookServer.Core.Models;
@@ -29,6 +30,29 @@ public sealed partial class EndpointEditorViewModel : ObservableObject
     public Array ExecutorTypes { get; } = Enum.GetValues(typeof(ExecutorType));
     public Array ResponseModes { get; } = Enum.GetValues(typeof(ResponseMode));
 
+    /// <summary>
+    /// Proxy for <see cref="EndpointConfig.AuthMode"/> that emits change notifications
+    /// for the visibility flags so the bearer/HMAC sections show/hide reactively.
+    /// </summary>
+    public AuthMode SelectedAuthMode
+    {
+        get => Endpoint.AuthMode;
+        set
+        {
+            if (Endpoint.AuthMode == value) return;
+            Endpoint.AuthMode = value;
+            OnPropertyChanged();
+            OnPropertyChanged(nameof(BearerVisible));
+            OnPropertyChanged(nameof(HmacVisible));
+        }
+    }
+
+    public Visibility BearerVisible =>
+        Endpoint.AuthMode == AuthMode.Bearer ? Visibility.Visible : Visibility.Collapsed;
+
+    public Visibility HmacVisible =>
+        Endpoint.AuthMode == AuthMode.Hmac ? Visibility.Visible : Visibility.Collapsed;
+
     public string AllowedClientsText
     {
         get => string.Join(Environment.NewLine, Endpoint.AllowedClients);
@@ -49,9 +73,9 @@ public sealed partial class EndpointEditorViewModel : ObservableObject
         }
     }
 
-    public string BearerSecretInput
+    public string BearerSecret
     {
-        get => "";
+        get => Endpoint.Bearer?.Secret.Plaintext ?? "";
         set
         {
             Endpoint.Bearer ??= new BearerOptions();
@@ -60,9 +84,9 @@ public sealed partial class EndpointEditorViewModel : ObservableObject
         }
     }
 
-    public string HmacSecretInput
+    public string HmacSecret
     {
-        get => "";
+        get => Endpoint.Hmac?.Secret.Plaintext ?? "";
         set
         {
             Endpoint.Hmac ??= new HmacOptions();