Initial scaffolding: PS_Launcher v0.2

Client (C# / .NET 8 / WPF, MVVM via CommunityToolkit.Mvvm):
- PSLauncher.App: WPF UI dark theme (Epic-style sidebar + hero + big play button)
  with UpdateAvailableDialog rendering Markdown release notes via Markdig.Wpf.
- PSLauncher.Core: services for installation registry (scans Proserve v{X.Y.Z}/),
  process launcher, manifest fetch, SHA-256 integrity, HTTP download with
  progress, ZIP install via .tmp + atomic rename, update orchestrator.
- PSLauncher.Models: RemoteManifest, InstalledVersion, LocalConfig DTOs.

Server (PHP 8 for OVH mutualisé, deployed under www/PS_Launcher/):
- Front controller + routes /manifest and /releasenotes/{version}.
- Static signed-manifest workflow with tools/sign-manifest.php CLI to
  recompute SHA-256 and sizeBytes after each ZIP upload.
- .htaccess: HTTPS redirect, rewrite, security headers.
- config.example.php template; real config.php is gitignored.

Cohabiting versions: each release lives in its own Proserve v{version}/ folder
under installRoot. Old versions are never deleted automatically.

Roadmap: v0.3 = HTTP Range resume + Polly retry + state.json,
v0.4 = MySQL license + Ed25519 signatures + DPAPI, v0.5 = settings/UX polish.

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

src/PSLauncher.App/App.xaml.cs

@@ -0,0 +1,84 @@
+using System.Net.Http;
+using System.Net.Http.Headers;
+using System.Windows;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.Hosting;
+using Microsoft.Extensions.Logging;
+using PSLauncher.App.ViewModels;
+using PSLauncher.App.Views;
+using PSLauncher.Core.Configuration;
+using PSLauncher.Core.Downloads;
+using PSLauncher.Core.Installations;
+using PSLauncher.Core.Integrity;
+using PSLauncher.Core.Manifests;
+using PSLauncher.Core.Process;
+using PSLauncher.Core.Updates;
+using PSLauncher.Models;
+
+namespace PSLauncher.App;
+
+public partial class App : Application
+{
+    private IHost? _host;
+
+    protected override void OnStartup(StartupEventArgs e)
+    {
+        base.OnStartup(e);
+
+        _host = Host.CreateDefaultBuilder()
+            .ConfigureLogging(b => { b.ClearProviders(); b.AddDebug(); })
+            .ConfigureServices((_, services) =>
+            {
+                services.AddSingleton<IConfigStore, ConfigStore>();
+                services.AddSingleton<LocalConfig>(sp => sp.GetRequiredService<IConfigStore>().Load());
+
+                // HttpClient partagé (timeout long pour les gros téléchargements)
+                services.AddSingleton(sp =>
+                {
+                    var http = new HttpClient(new SocketsHttpHandler
+                    {
+                        PooledConnectionLifetime = TimeSpan.FromMinutes(5),
+                        AutomaticDecompression = System.Net.DecompressionMethods.All
+                    })
+                    {
+                        Timeout = Timeout.InfiniteTimeSpan
+                    };
+                    http.DefaultRequestHeaders.UserAgent.Add(new ProductInfoHeaderValue("PSLauncher", "0.2"));
+                    return http;
+                });
+
+                services.AddSingleton<IInstallationRegistry>(sp =>
+                    new InstallationRegistry(
+                        sp.GetRequiredService<ILogger<InstallationRegistry>>(),
+                        () => sp.GetRequiredService<LocalConfig>().InstallRoot));
+
+                services.AddSingleton<IProcessLauncher, ProcessLauncher>();
+                services.AddSingleton<IIntegrityService, IntegrityService>();
+                services.AddSingleton<IZipInstaller, ZipInstaller>();
+
+                services.AddSingleton<IManifestService>(sp =>
+                    new ManifestService(
+                        sp.GetRequiredService<HttpClient>(),
+                        () => sp.GetRequiredService<LocalConfig>().ServerBaseUrl,
+                        sp.GetRequiredService<ILogger<ManifestService>>()));
+
+                services.AddSingleton<IDownloadManager, DownloadManager>();
+                services.AddSingleton<IUpdateChecker, UpdateChecker>();
+
+                services.AddSingleton<MainViewModel>();
+                services.AddSingleton<MainWindow>();
+            })
+            .Build();
+
+        var window = _host.Services.GetRequiredService<MainWindow>();
+        window.DataContext = _host.Services.GetRequiredService<MainViewModel>();
+        MainWindow = window;
+        window.Show();
+    }
+
+    protected override void OnExit(ExitEventArgs e)
+    {
+        _host?.Dispose();
+        base.OnExit(e);
+    }
+}