TASK 10: Polar billing + Velopack auto-updates (steps 1-7)

App.xaml.cs

@@ -1,5 +1,6 @@
 using System.Windows;
 using System.Windows.Threading;
+using Velopack;
 using ytLive.Helpers;
 
 namespace ytLive;
@@ -16,9 +17,6 @@ public partial class App : Application
 
     protected override void OnStartup(StartupEventArgs e)
     {
-        // The app is a WinExe (no visible console) and is often debugged from
-        // WSL where it can't even run, so startup checkpoints and any unhandled
-        // exception are written to %APPDATA%\ytLlive\startup.log via AppLog.
         AppDomain.CurrentDomain.UnhandledException += (_, args) =>
             AppLog.Write(args.ExceptionObject is Exception ex
                 ? "AppDomain unhandled exception: " + ex
@@ -28,6 +26,21 @@ public partial class App : Application
             AppLog.Write(args.Exception, "Dispatcher unhandled exception");
 
         AppLog.Write("App OnStartup begin");
+
+        // Velopack auto-update bootstrap — checks for updates on startup and
+        // applies them (the app restarts automatically if an update is found).
+        // Update URL is configured per-deployment (self-hosted on DO droplet);
+        // when no URL is set, the check is a no-op.
+        try
+        {
+            VelopackApp.Build()
+                .Run();
+        }
+        catch (Exception ex)
+        {
+            AppLog.Write($"Velopack bootstrap failed (non-fatal): {ex.Message}");
+        }
+
         base.OnStartup(e);
         AppLog.Write("App OnStartup end");
     }