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/Views/MainWindow.xaml

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+<Window x:Class="PSLauncher.App.Views.MainWindow"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        xmlns:vm="clr-namespace:PSLauncher.App.ViewModels"
+        xmlns:views="clr-namespace:PSLauncher.App.Views"
+        Title="PROSERVE Launcher"
+        Width="1280" Height="800"
+        MinWidth="900" MinHeight="600"
+        WindowStartupLocation="CenterScreen"
+        d:DataContext="{d:DesignInstance Type=vm:MainViewModel}"
+        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+        mc:Ignorable="d"
+        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006">
+
+    <Grid>
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />   <!-- Top bar -->
+            <RowDefinition Height="*" />      <!-- Body -->
+            <RowDefinition Height="Auto" />   <!-- Footer (download) -->
+        </Grid.RowDefinitions>
+
+        <!-- Top bar -->
+        <Border Grid.Row="0" Background="{StaticResource Brush.Bg.Sidebar}"
+                BorderBrush="{StaticResource Brush.Border}" BorderThickness="0,0,0,1"
+                Padding="20,12">
+            <Grid>
+                <TextBlock Text="PROSERVE" FontSize="18" FontWeight="Bold"
+                           Foreground="{StaticResource Brush.Text.Primary}"
+                           VerticalAlignment="Center" />
+                <StackPanel HorizontalAlignment="Right" Orientation="Horizontal" VerticalAlignment="Center">
+                    <TextBlock Text="{Binding LicenseSummary}"
+                               Foreground="{StaticResource Brush.Text.Secondary}"
+                               VerticalAlignment="Center" Margin="0,0,12,0" />
+                </StackPanel>
+            </Grid>
+        </Border>
+
+        <!-- Body : sidebar + content -->
+        <Grid Grid.Row="1">
+            <Grid.ColumnDefinitions>
+                <ColumnDefinition Width="200" />
+                <ColumnDefinition Width="*" />
+            </Grid.ColumnDefinitions>
+
+            <!-- Sidebar -->
+            <Border Grid.Column="0" Background="{StaticResource Brush.Bg.Sidebar}"
+                    BorderBrush="{StaticResource Brush.Border}" BorderThickness="0,0,1,0">
+                <StackPanel>
+                    <RadioButton Style="{StaticResource SidebarItem}" GroupName="Nav"
+                                 Content="📚  Bibliothèque" IsChecked="True" />
+                    <RadioButton Style="{StaticResource SidebarItem}" GroupName="Nav"
+                                 Content="📰  Nouveautés" IsEnabled="False" />
+                    <RadioButton Style="{StaticResource SidebarItem}" GroupName="Nav"
+                                 Content="⚙️  Paramètres" IsEnabled="False" />
+                </StackPanel>
+            </Border>
+
+            <!-- Library content -->
+            <ScrollViewer Grid.Column="1" VerticalScrollBarVisibility="Auto">
+                <StackPanel Margin="40,30">
+
+                    <!-- Hero -->
+                    <Border Background="#2A2A30" CornerRadius="8" Height="280"
+                            BorderBrush="{StaticResource Brush.Border}" BorderThickness="1">
+                        <Grid>
+                            <TextBlock Text="PROSERVE"
+                                       FontSize="64" FontWeight="Bold"
+                                       Foreground="#3D3D45"
+                                       HorizontalAlignment="Center" VerticalAlignment="Center" />
+                            <Border VerticalAlignment="Bottom" HorizontalAlignment="Left"
+                                    Margin="24" Background="#000000B0"
+                                    CornerRadius="4" Padding="12,6">
+                                <TextBlock Text="{Binding HeroTitle}"
+                                           FontSize="22" FontWeight="SemiBold"
+                                           Foreground="White" />
+                            </Border>
+                        </Grid>
+                    </Border>
+
+                    <!-- Action row -->
+                    <Grid Margin="0,24,0,0">
+                        <Grid.ColumnDefinitions>
+                            <ColumnDefinition Width="Auto" />
+                            <ColumnDefinition Width="*" />
+                            <ColumnDefinition Width="Auto" />
+                        </Grid.ColumnDefinitions>
+
+                        <!-- Version selector -->
+                        <StackPanel Grid.Column="0" Orientation="Horizontal" VerticalAlignment="Center">
+                            <TextBlock Text="Version :" Foreground="{StaticResource Brush.Text.Secondary}"
+                                       VerticalAlignment="Center" Margin="0,0,10,0" />
+                            <ComboBox Width="160"
+                                      ItemsSource="{Binding InstalledVersions}"
+                                      DisplayMemberPath="Display"
+                                      SelectedItem="{Binding SelectedVersion, Mode=TwoWay}" />
+                            <Border Style="{StaticResource VersionPill}" Margin="12,0,0,0">
+                                <TextBlock Text="{Binding StatusBadge}" FontSize="12"
+                                           Foreground="{StaticResource Brush.Text.Primary}" />
+                            </Border>
+                        </StackPanel>
+
+                        <!-- Primary action -->
+                        <Button Grid.Column="2"
+                                Style="{StaticResource PrimaryButton}"
+                                Content="{Binding PrimaryActionLabel}"
+                                Command="{Binding PrimaryActionCommand}"
+                                IsEnabled="{Binding PrimaryActionEnabled}" />
+                    </Grid>
+
+                    <!-- Secondary actions -->
+                    <StackPanel Orientation="Horizontal" Margin="0,16,0,0">
+                        <Button Style="{StaticResource SecondaryButton}"
+                                Content="🔄  Vérifier les mises à jour"
+                                Command="{Binding CheckForUpdatesCommand}"
+                                Margin="0,0,10,0" />
+                        <Button Style="{StaticResource SecondaryButton}"
+                                Content="📁  Ouvrir le dossier"
+                                Command="{Binding OpenFolderCommand}"
+                                Margin="0,0,10,0" />
+                        <Button Style="{StaticResource SecondaryButton}"
+                                Content="🔍  Rescanner local"
+                                Command="{Binding RefreshCommand}" />
+                    </StackPanel>
+
+                    <!-- Installed versions list -->
+                    <TextBlock Text="Versions installées" FontSize="16" FontWeight="SemiBold"
+                               Margin="0,30,0,12"
+                               Foreground="{StaticResource Brush.Text.Primary}" />
+                    <ItemsControl ItemsSource="{Binding InstalledVersions}">
+                        <ItemsControl.ItemTemplate>
+                            <DataTemplate>
+                                <Border Background="{StaticResource Brush.Bg.Card}"
+                                        CornerRadius="6" Margin="0,0,0,8" Padding="16,12"
+                                        BorderBrush="{StaticResource Brush.Border}" BorderThickness="1">
+                                    <Grid>
+                                        <Grid.ColumnDefinitions>
+                                            <ColumnDefinition Width="*" />
+                                            <ColumnDefinition Width="Auto" />
+                                        </Grid.ColumnDefinitions>
+                                        <StackPanel Grid.Column="0">
+                                            <TextBlock Text="{Binding Display}"
+                                                       FontSize="15" FontWeight="SemiBold" />
+                                            <TextBlock Text="{Binding Subtitle}"
+                                                       FontSize="12"
+                                                       Foreground="{StaticResource Brush.Text.Secondary}"
+                                                       Margin="0,2,0,0" />
+                                        </StackPanel>
+                                    </Grid>
+                                </Border>
+                            </DataTemplate>
+                        </ItemsControl.ItemTemplate>
+                    </ItemsControl>
+
+                    <!-- Empty state -->
+                    <TextBlock Text="{Binding EmptyHint}"
+                               Foreground="{StaticResource Brush.Text.Secondary}"
+                               TextWrapping="Wrap" Margin="0,12,0,0"
+                               Visibility="{Binding EmptyHintVisibility}" />
+
+                </StackPanel>
+            </ScrollViewer>
+        </Grid>
+
+        <!-- Footer (download/install status) -->
+        <Border Grid.Row="2" Background="{StaticResource Brush.Bg.Footer}"
+                BorderBrush="{StaticResource Brush.Border}" BorderThickness="0,1,0,0"
+                Padding="20,8"
+                Visibility="{Binding FooterVisibility}">
+            <Grid>
+                <Grid.ColumnDefinitions>
+                    <ColumnDefinition Width="*" />
+                    <ColumnDefinition Width="Auto" />
+                </Grid.ColumnDefinitions>
+                <StackPanel Grid.Column="0">
+                    <TextBlock Text="{Binding FooterText}"
+                               Foreground="{StaticResource Brush.Text.Secondary}" />
+                    <ProgressBar Height="4" Margin="0,4,0,0"
+                                 Value="{Binding ProgressPercent}"
+                                 Maximum="100"
+                                 Foreground="{StaticResource Brush.Accent}"
+                                 Background="#2A2A30"
+                                 BorderThickness="0" />
+                </StackPanel>
+                <Button Grid.Column="1"
+                        Style="{StaticResource SecondaryButton}"
+                        Content="Annuler"
+                        VerticalAlignment="Center"
+                        Margin="12,0,0,0"
+                        Command="{Binding CancelDownloadCommand}"
+                        Visibility="{Binding IsBusy, Converter={StaticResource BoolToVisibility}}" />
+            </Grid>
+        </Border>
+    </Grid>
+</Window>

src/PSLauncher.App/Views/MainWindow.xaml.cs

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+using System.Windows;
+
+namespace PSLauncher.App.Views;
+
+public partial class MainWindow : Window
+{
+    public MainWindow()
+    {
+        InitializeComponent();
+    }
+}

src/PSLauncher.App/Views/UpdateAvailableDialog.xaml

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+<Window x:Class="PSLauncher.App.Views.UpdateAvailableDialog"
+        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+        Title="Mise à jour disponible"
+        Width="640" Height="540"
+        MinWidth="480" MinHeight="400"
+        WindowStartupLocation="CenterOwner"
+        Background="{StaticResource Brush.Bg.Window}">
+    <Grid Margin="24">
+        <Grid.RowDefinitions>
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="Auto" />
+            <RowDefinition Height="*" />
+            <RowDefinition Height="Auto" />
+        </Grid.RowDefinitions>
+
+        <TextBlock Grid.Row="0"
+                   Text="{Binding Title}"
+                   FontSize="22" FontWeight="SemiBold"
+                   Foreground="{StaticResource Brush.Text.Primary}" />
+
+        <TextBlock Grid.Row="1"
+                   Text="{Binding Subtitle}"
+                   Foreground="{StaticResource Brush.Text.Secondary}"
+                   Margin="0,4,0,18" />
+
+        <Border Grid.Row="2"
+                Background="{StaticResource Brush.Bg.Card}"
+                BorderBrush="{StaticResource Brush.Border}" BorderThickness="1"
+                CornerRadius="6"
+                Padding="16">
+            <FlowDocumentScrollViewer
+                Document="{Binding ReleaseNotesDocument}"
+                Foreground="{StaticResource Brush.Text.Primary}"
+                Background="Transparent" />
+        </Border>
+
+        <StackPanel Grid.Row="3" Orientation="Horizontal" HorizontalAlignment="Right" Margin="0,18,0,0">
+            <Button Style="{StaticResource SecondaryButton}"
+                    Content="Plus tard"
+                    IsCancel="True"
+                    Margin="0,0,12,0"
+                    Click="OnLater" />
+            <Button Style="{StaticResource PrimaryButton}"
+                    Content="⬇  Télécharger"
+                    Padding="32,10"
+                    Click="OnDownload" />
+        </StackPanel>
+    </Grid>
+</Window>

src/PSLauncher.App/Views/UpdateAvailableDialog.xaml.cs

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+using System.Windows;
+using System.Windows.Documents;
+using Markdig;
+using Markdig.Wpf;
+using PSLauncher.Models;
+
+namespace PSLauncher.App.Views;
+
+public partial class UpdateAvailableDialog : Window
+{
+    public UpdateAvailableDialog(VersionManifest version, string releaseNotesMarkdown)
+    {
+        InitializeComponent();
+
+        var pipeline = new MarkdownPipelineBuilder()
+            .UseSupportedExtensions()
+            .Build();
+        FlowDocument doc;
+        try
+        {
+            doc = Markdig.Wpf.Markdown.ToFlowDocument(releaseNotesMarkdown, pipeline);
+        }
+        catch
+        {
+            doc = new FlowDocument(new Paragraph(new Run(releaseNotesMarkdown)));
+        }
+
+        DataContext = new
+        {
+            Title = $"Proserve v{version.Version} disponible",
+            Subtitle = $"Date de release : {version.ReleasedAt.ToLocalTime():dd MMMM yyyy} • {FormatSize(version.Download.SizeBytes)}",
+            ReleaseNotesDocument = doc
+        };
+    }
+
+    public bool DownloadRequested { get; private set; }
+
+    private void OnDownload(object sender, RoutedEventArgs e)
+    {
+        DownloadRequested = true;
+        DialogResult = true;
+        Close();
+    }
+
+    private void OnLater(object sender, RoutedEventArgs e)
+    {
+        DownloadRequested = false;
+        DialogResult = false;
+        Close();
+    }
+
+    private static string FormatSize(long bytes)
+    {
+        if (bytes <= 0) return "taille inconnue";
+        string[] units = { "o", "Ko", "Mo", "Go", "To" };
+        double v = bytes;
+        int u = 0;
+        while (v >= 1024 && u < units.Length - 1) { v /= 1024; u++; }
+        return $"{v:0.#} {units[u]}";
+    }
+}