UI: ASTERION logo left of PROSERVE wordmark + minimize on launch

Brand mark
----------
Resources/logo-asterion-white.png embedded as a WPF Resource. Placed
in the top-bar StackPanel before the PROSERVE Pirulen wordmark, at
36px height, with HighQuality bitmap scaling and SnapsToDevicePixels
to keep the white logo crisp against the dark chrome.

Minimize on launch
------------------
Once a Proserve version is started via _processLauncher.Launch(),
the MainWindow drops to WindowState.Minimized so it doesn't sit on
top of the game. The launcher stays running (so the user can come
back to install / switch / see the badge license), just out of the way.

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

src/PSLauncher.App/ViewModels/MainViewModel.cs

@@ -427,6 +427,10 @@ public sealed partial class MainViewModel : ObservableObject
             _processLauncher.Launch(row.Installed);
             _config.LastLaunchedVersion = row.Version;
             _configStore.Save(_config);
+
+            // Réduit la fenêtre du launcher pour ne pas gêner Proserve qui démarre
+            if (Application.Current.MainWindow is { } mw)
+                mw.WindowState = WindowState.Minimized;
         }
         catch (Exception ex)
         {