DB migrations: bundled SQL applied automatically after install

Each PROSERVE ZIP can now ship a _migrations/ subfolder with versioned SQL
scripts. The launcher applies them right after extraction, in the same
install session as the binary copy, so the user never lands on a PROSERVE
build whose schema doesn't match its code.

Service (PSLauncher.Core/Migrations)
- IDatabaseMigrationService + DatabaseMigrationService (MySqlConnector,
  BSD-licensed). Each .sql runs in a transaction; on failure the DB
  state is rolled back and the install completes (files only) but the
  user is warned to fix the connection / replay later.
- Tracking table _launcher_migrations (filename, applied_at, checksum,
  duration_ms) — same model as Flyway / Doctrine. Already-applied scripts
  are skipped on subsequent installs. Modified scripts trigger a warning
  log without blocking.
- Custom SQL splitter that respects strings/comments/backticks so a single
  .sql file can contain multiple statements separated by `;`.
- DatabasePasswordProtector: DPAPI CurrentUser scope for the MySQL password
  in config.json (same protection as the license key).

Config (PSLauncher.Models/LocalConfig.cs)
- New DatabaseConfig section: Host=localhost, Port=3306, User=root, empty
  password, Database=proserve, AutoApplyMigrations=true. Defaults match a
  fresh XAMPP install. Override via Settings (next commit).

Install pipeline (MainViewModel)
- After ZipInstaller.InstallAsync and before declaring the install complete,
  if AutoApplyMigrations and a _migrations/ folder exists, run
  ApplyMigrationsAsync with progress reporting (per-file %, filename in
  footer). Failure shows MsgMigrationFailed dialog explaining XAMPP must
  be running and pointing to Settings → Database for connection params.

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

src/PSLauncher.App/App.xaml.cs

@@ -16,6 +16,7 @@ using PSLauncher.Core.Integrity;
 using PSLauncher.Core.Licensing;
 using PSLauncher.Core.Localization;
 using PSLauncher.Core.Manifests;
+using PSLauncher.Core.Migrations;
 using PSLauncher.Core.Process;
 using PSLauncher.Core.Updates;
 using PSLauncher.Models;
@@ -162,6 +163,17 @@ public partial class App : Application
 
                 services.AddSingleton<IToastService, ToastService>();
 
+                // Migration DB MySQL : appliquée juste après extraction d'un build PROSERVE
+                // si le ZIP contient un sous-répertoire _migrations/. La config DB et le
+                // password (DPAPI) sont lus à la demande pour refléter les changements
+                // utilisateur dans Settings sans recréer le service.
+                services.AddSingleton<IDatabaseMigrationService>(sp =>
+                    new DatabaseMigrationService(
+                        configProvider: () => sp.GetRequiredService<LocalConfig>().Database,
+                        passwordProvider: () => DatabasePasswordProtector.Unprotect(
+                            sp.GetRequiredService<LocalConfig>().Database.EncryptedPassword),
+                        sp.GetRequiredService<ILogger<DatabaseMigrationService>>()));
+
                 services.AddTransient<SettingsViewModel>();
                 services.AddSingleton<MainViewModel>();
                 services.AddSingleton<MainWindow>();

src/PSLauncher.App/ViewModels/MainViewModel.cs

@@ -14,6 +14,7 @@ using PSLauncher.Core.Installations;
 using PSLauncher.Core.Licensing;
 using PSLauncher.Core.Localization;
 using PSLauncher.Core.Manifests;
+using PSLauncher.Core.Migrations;
 using PSLauncher.Core.Process;
 using PSLauncher.Core.Updates;
 using PSLauncher.Models;
@@ -33,6 +34,7 @@ public sealed partial class MainViewModel : ObservableObject
     private readonly ILicenseService _licenseService;
     private readonly ILauncherSelfUpdater _selfUpdater;
     private readonly IToastService _toastService;
+    private readonly IDatabaseMigrationService _migrationService;
     private readonly IServiceProvider _serviceProvider;
     private readonly ILogger<MainViewModel> _logger;
 
@@ -173,6 +175,7 @@ public sealed partial class MainViewModel : ObservableObject
         ILicenseService licenseService,
         ILauncherSelfUpdater selfUpdater,
         IToastService toastService,
+        IDatabaseMigrationService migrationService,
         IServiceProvider serviceProvider,
         ILogger<MainViewModel> logger)
     {
@@ -187,6 +190,7 @@ public sealed partial class MainViewModel : ObservableObject
         _licenseService = licenseService;
         _selfUpdater = selfUpdater;
         _toastService = toastService;
+        _migrationService = migrationService;
         _serviceProvider = serviceProvider;
         _logger = logger;
 
@@ -655,6 +659,45 @@ public sealed partial class MainViewModel : ObservableObject
 
             try { File.Delete(zipPath); } catch { /* non critique */ }
 
+            // 5) Migrations DB MySQL bundled dans _migrations/. Skip si la config
+            //    a désactivé l'auto-apply ou si le ZIP ne contient pas de répertoire.
+            if (_config.Database.AutoApplyMigrations)
+            {
+                StatusMessage = Strings.StatusApplyingMigrations(row.Version);
+                ProgressDetail = null;
+                ProgressPercent = 0;
+                var migProgress = new Progress<MigrationProgress>(mp =>
+                {
+                    if (mp.Total > 0)
+                    {
+                        var pct = (double)mp.Done / mp.Total * 100.0;
+                        ProgressPercent = pct;
+                        row.ProgressPercent = pct;
+                    }
+                    var label = string.IsNullOrEmpty(mp.CurrentFilename)
+                        ? Strings.StatusApplyingMigrations(row.Version)
+                        : Strings.ProgressMigration(mp.Done + 1, mp.Total, mp.CurrentFilename);
+                    ProgressDetail = label;
+                    row.ProgressDetail = label;
+                });
+                var migResult = await _migrationService.ApplyMigrationsAsync(target, migProgress, ct);
+                if (!migResult.AllSucceeded)
+                {
+                    // L'install a réussi côté fichiers ; on garde la version installée mais on
+                    // notifie l'utilisateur que la DB n'a pas été migrée — la prochaine relance
+                    // de l'install (ou un Settings → "Rejouer migrations") tentera à nouveau.
+                    _logger.LogError("DB migration failed for v{Version}: {Detail}", row.Version, migResult.FailureMessage);
+                    MessageBox.Show(
+                        Strings.MsgMigrationFailed(migResult.FailureMessage ?? "?"),
+                        Strings.MsgBoxMigrationFailed,
+                        MessageBoxButton.OK, MessageBoxImage.Warning);
+                }
+                else if (migResult.AppliedCount > 0)
+                {
+                    _logger.LogInformation("Applied {N} DB migration(s) for v{Version}", migResult.AppliedCount, row.Version);
+                }
+            }
+
             StatusMessage = Strings.StatusInstalledSuccess(row.Version);
             ProgressDetail = null;
             ProgressPercent = 0;