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.Models/RemoteManifest.cs

@@ -0,0 +1,71 @@
+using System.Text.Json.Serialization;
+
+namespace PSLauncher.Models;
+
+public sealed class RemoteManifest
+{
+    [JsonPropertyName("schemaVersion")]
+    public int SchemaVersion { get; set; }
+
+    [JsonPropertyName("product")]
+    public string Product { get; set; } = string.Empty;
+
+    [JsonPropertyName("latest")]
+    public string Latest { get; set; } = string.Empty;
+
+    [JsonPropertyName("publishedAt")]
+    public DateTime? PublishedAt { get; set; }
+
+    [JsonPropertyName("minLauncherVersion")]
+    public string? MinLauncherVersion { get; set; }
+
+    [JsonPropertyName("versions")]
+    public List<VersionManifest> Versions { get; set; } = new();
+
+    [JsonPropertyName("signature")]
+    public string? Signature { get; set; }
+}
+
+public sealed class VersionManifest
+{
+    [JsonPropertyName("version")]
+    public string Version { get; set; } = string.Empty;
+
+    [JsonPropertyName("releasedAt")]
+    public DateTime ReleasedAt { get; set; }
+
+    [JsonPropertyName("executable")]
+    public string Executable { get; set; } = "PROSERVE_UE_5_5.exe";
+
+    [JsonPropertyName("installFolderTemplate")]
+    public string InstallFolderTemplate { get; set; } = "Proserve v{version}";
+
+    [JsonPropertyName("download")]
+    public DownloadDescriptor Download { get; set; } = new();
+
+    [JsonPropertyName("releaseNotesUrl")]
+    public string? ReleaseNotesUrl { get; set; }
+
+    [JsonPropertyName("minLicenseDate")]
+    public DateTime? MinLicenseDate { get; set; }
+
+    [JsonPropertyName("availableForDownload")]
+    public bool AvailableForDownload { get; set; } = true;
+
+    [JsonPropertyName("heroImageUrl")]
+    public string? HeroImageUrl { get; set; }
+
+    public string GetInstallFolderName() => InstallFolderTemplate.Replace("{version}", Version);
+}
+
+public sealed class DownloadDescriptor
+{
+    [JsonPropertyName("url")]
+    public string Url { get; set; } = string.Empty;
+
+    [JsonPropertyName("sizeBytes")]
+    public long SizeBytes { get; set; }
+
+    [JsonPropertyName("sha256")]
+    public string Sha256 { get; set; } = string.Empty;
+}