Settings: Database section with connection params, test, and replay button

New « BASE DE DONNÉES (XAMPP / MySQL) » section in Paramètres covering:

- Host / Port / User / Password / Database — defaults match a fresh XAMPP
  install (localhost:3306, root, empty password, "proserve"). Password is
  DPAPI-encrypted in config.json (same scheme as the license key).
- « Tester » button — opens a fresh MySqlConnection and runs SELECT 1.
  Shows ✓ OK or the connection error inline.
- « Appliquer automatiquement les migrations à l'install » checkbox — opt-in
  for the post-install migration step. Default true.
- « 🔁 Rejouer les migrations » button — manually re-runs ApplyMigrationsAsync
  on the latest installed version. Useful when the post-install run failed
  (XAMPP was off) or after a dev added a new SQL file. Live status « 3/5 :
  0042_add_index.sql » + final « ✓ N applied, M skipped » or « ✗ failure ».
- Hint paragraph below explaining the _migrations/ convention.

SettingsViewModel
- Pulls IDatabaseMigrationService and IInstallationRegistry via DI.
- Save() now also persists the DB block, encrypting the password before write.
- TestDbAsync temporarily swaps the in-memory config so the service sees the
  values being typed (without persisting until Save).

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

src/PSLauncher.App/ViewModels/SettingsViewModel.cs

@@ -8,8 +8,10 @@ using CommunityToolkit.Mvvm.Input;
 using Microsoft.Extensions.Logging;
 using PSLauncher.Core.Configuration;
 using PSLauncher.Core.Downloads;
+using PSLauncher.Core.Installations;
 using PSLauncher.Core.Licensing;
 using PSLauncher.Core.Localization;
+using PSLauncher.Core.Migrations;
 using PSLauncher.Models;
 
 namespace PSLauncher.App.ViewModels;
@@ -27,6 +29,8 @@ public sealed partial class SettingsViewModel : ObservableObject
     private readonly LocalConfig _config;
     private readonly ILicenseService _licenseService;
     private readonly IDownloadStateStore _downloadStore;
+    private readonly IDatabaseMigrationService _migrationService;
+    private readonly IInstallationRegistry _registry;
     private readonly HttpClient _http;
     private readonly ILogger<SettingsViewModel> _logger;
 
@@ -39,6 +43,18 @@ public sealed partial class SettingsViewModel : ObservableObject
     [ObservableProperty] private string _installRoot;
     [ObservableProperty] private string _language;
 
+    // ----- DB Migration settings -----
+    [ObservableProperty] private string _dbHost;
+    [ObservableProperty] private uint _dbPort;
+    [ObservableProperty] private string _dbUser;
+    [ObservableProperty] private string _dbPassword;
+    [ObservableProperty] private string _dbName;
+    [ObservableProperty] private bool _dbAutoApplyMigrations;
+    [ObservableProperty] private string? _dbConnectionStatus;
+    [ObservableProperty] private bool _isTestingDb;
+    [ObservableProperty] private string? _migrationsReplayStatus;
+    [ObservableProperty] private bool _isReplayingMigrations;
+
     public IReadOnlyList<LanguageOption> AvailableLanguages { get; } =
         PSLauncher.Core.Localization.Strings.Available
             .Select(t => new LanguageOption(t.Code, t.Name))
@@ -105,6 +121,8 @@ public sealed partial class SettingsViewModel : ObservableObject
         LocalConfig config,
         ILicenseService licenseService,
         IDownloadStateStore downloadStore,
+        IDatabaseMigrationService migrationService,
+        IInstallationRegistry registry,
         HttpClient http,
         ILogger<SettingsViewModel> logger)
     {
@@ -112,6 +130,8 @@ public sealed partial class SettingsViewModel : ObservableObject
         _config = config;
         _licenseService = licenseService;
         _downloadStore = downloadStore;
+        _migrationService = migrationService;
+        _registry = registry;
         _http = http;
         _logger = logger;
 
@@ -119,6 +139,13 @@ public sealed partial class SettingsViewModel : ObservableObject
         _installRoot = config.InstallRoot;
         _language = string.IsNullOrWhiteSpace(config.Language) ? "auto" : config.Language;
 
+        _dbHost = config.Database.Host;
+        _dbPort = config.Database.Port;
+        _dbUser = config.Database.User;
+        _dbPassword = DatabasePasswordProtector.Unprotect(config.Database.EncryptedPassword) ?? string.Empty;
+        _dbName = config.Database.Database;
+        _dbAutoApplyMigrations = config.Database.AutoApplyMigrations;
+
         LauncherVersion = Assembly.GetExecutingAssembly().GetName().Version?.ToString() ?? "0.0.0";
         MachineId = licenseService.GetMachineId();
         LogsDirectory = App.LogsDirectory;
@@ -225,6 +252,17 @@ public sealed partial class SettingsViewModel : ObservableObject
         _config.ServerBaseUrl = ServerBaseUrl.TrimEnd('/');
         _config.InstallRoot = InstallRoot;
         _config.Language = Language ?? "auto";
+
+        // DB settings
+        _config.Database.Host = DbHost.Trim();
+        _config.Database.Port = DbPort > 0 ? DbPort : 3306;
+        _config.Database.User = DbUser.Trim();
+        _config.Database.EncryptedPassword = string.IsNullOrEmpty(DbPassword)
+            ? null
+            : DatabasePasswordProtector.Protect(DbPassword);
+        _config.Database.Database = DbName.Trim();
+        _config.Database.AutoApplyMigrations = DbAutoApplyMigrations;
+
         _configStore.Save(_config);
         _logger.LogInformation("Settings saved (language={Lang}, changed={Changed})", _config.Language, languageChanged);
 
@@ -289,4 +327,99 @@ public sealed partial class SettingsViewModel : ObservableObject
     }
 
     private static string FormatSize(long bytes) => Strings.FormatSize(bytes);
+
+    // ===================== DB MIGRATIONS =====================
+
+    /// <summary>
+    /// Test la connexion à la DB MySQL avec les paramètres en cours de saisie.
+    /// Persiste temporairement les valeurs sur _config.Database avant le test
+    /// pour que le service les voie via son configProvider, puis remet (et le
+    /// Save() final écrasera quand l'utilisateur cliquera Enregistrer).
+    /// </summary>
+    [RelayCommand]
+    private async Task TestDbAsync()
+    {
+        DbConnectionStatus = Strings.SettingsTest + "…";
+        IsTestingDb = true;
+        // On applique temporairement les valeurs saisies
+        var oldHost = _config.Database.Host;
+        var oldPort = _config.Database.Port;
+        var oldUser = _config.Database.User;
+        var oldPwd  = _config.Database.EncryptedPassword;
+        var oldDb   = _config.Database.Database;
+        try
+        {
+            _config.Database.Host = DbHost.Trim();
+            _config.Database.Port = DbPort > 0 ? DbPort : 3306;
+            _config.Database.User = DbUser.Trim();
+            _config.Database.EncryptedPassword = string.IsNullOrEmpty(DbPassword)
+                ? null
+                : DatabasePasswordProtector.Protect(DbPassword);
+            _config.Database.Database = DbName.Trim();
+
+            var err = await _migrationService.TestConnectionAsync(CancellationToken.None);
+            DbConnectionStatus = err is null ? "✓ OK" : $"✗ {err}";
+        }
+        catch (Exception ex) { DbConnectionStatus = $"✗ {ex.Message}"; }
+        finally
+        {
+            // Restaure : seul Save() doit écrire pour de bon
+            _config.Database.Host = oldHost;
+            _config.Database.Port = oldPort;
+            _config.Database.User = oldUser;
+            _config.Database.EncryptedPassword = oldPwd;
+            _config.Database.Database = oldDb;
+            IsTestingDb = false;
+        }
+    }
+
+    /// <summary>
+    /// Re-joue les migrations bundled dans le _migrations/ de la version actuellement
+    /// installée la plus récente. Utile si l'auto-apply post-install avait échoué (ex.
+    /// XAMPP éteint à ce moment-là), ou pour rejouer manuellement après ajout d'une
+    /// nouvelle migration côté dev.
+    /// </summary>
+    [RelayCommand]
+    private async Task ReplayMigrationsAsync()
+    {
+        var installed = _registry.Scan().OrderByDescending(v => v.Version).FirstOrDefault();
+        if (installed is null)
+        {
+            MigrationsReplayStatus = "Aucune version installée — installe d'abord une version avec _migrations/.";
+            return;
+        }
+        IsReplayingMigrations = true;
+        MigrationsReplayStatus = $"Réapplication des migrations pour v{installed.Version}…";
+        try
+        {
+            var progress = new Progress<MigrationProgress>(mp =>
+            {
+                if (mp.Total > 0)
+                    MigrationsReplayStatus = $"{mp.Done + 1}/{mp.Total} : {mp.CurrentFilename}";
+            });
+            // Il faut persister les éventuelles modifs DB avant le test (le service lit la config courante)
+            Save();
+            var result = await _migrationService.ApplyMigrationsAsync(
+                installed.FolderPath, progress, CancellationToken.None);
+            if (result.AllSucceeded)
+            {
+                MigrationsReplayStatus = result.AppliedCount > 0
+                    ? $"✓ {result.AppliedCount} migration(s) appliquée(s), {result.SkippedCount} déjà en place."
+                    : $"✓ Tout est à jour ({result.SkippedCount} déjà appliquée(s))";
+            }
+            else
+            {
+                MigrationsReplayStatus = $"✗ Échec : {result.FailureMessage}";
+            }
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Replay migrations failed");
+            MigrationsReplayStatus = $"✗ Erreur : {ex.Message}";
+        }
+        finally
+        {
+            IsReplayingMigrations = false;
+        }
+    }
 }

src/PSLauncher.App/Views/SettingsDialog.xaml

@@ -248,6 +248,115 @@
                     </StackPanel>
                 </Border>
 
+                <!-- Base de données (XAMPP / MySQL) — config + test + replay -->
+                <Border Background="{StaticResource Brush.Bg.Card}"
+                        BorderBrush="{StaticResource Brush.Border}" BorderThickness="1"
+                        CornerRadius="6" Padding="20" Margin="0,0,0,16">
+                    <StackPanel>
+                        <TextBlock Text="{x:Static loc:Strings.SettingsDatabase}"
+                                   FontSize="11" FontWeight="Bold"
+                                   Foreground="{StaticResource Brush.Text.Secondary}"
+                                   Margin="0,0,0,8" />
+
+                        <Grid Margin="0,0,0,8">
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="100" />
+                            </Grid.ColumnDefinitions>
+                            <StackPanel Grid.Column="0" Margin="0,0,8,0">
+                                <TextBlock Text="{x:Static loc:Strings.SettingsDbHost}"
+                                           Foreground="{StaticResource Brush.Text.Secondary}"
+                                           FontSize="12" Margin="0,0,0,4" />
+                                <TextBox Text="{Binding DbHost, UpdateSourceTrigger=PropertyChanged}"
+                                         Background="#1A1A20" Foreground="{StaticResource Brush.Text.Primary}"
+                                         BorderBrush="{StaticResource Brush.Border}" BorderThickness="1" Padding="8" />
+                            </StackPanel>
+                            <StackPanel Grid.Column="1">
+                                <TextBlock Text="{x:Static loc:Strings.SettingsDbPort}"
+                                           Foreground="{StaticResource Brush.Text.Secondary}"
+                                           FontSize="12" Margin="0,0,0,4" />
+                                <TextBox Text="{Binding DbPort, UpdateSourceTrigger=PropertyChanged}"
+                                         Background="#1A1A20" Foreground="{StaticResource Brush.Text.Primary}"
+                                         BorderBrush="{StaticResource Brush.Border}" BorderThickness="1" Padding="8" />
+                            </StackPanel>
+                        </Grid>
+
+                        <Grid Margin="0,0,0,8">
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="*" />
+                            </Grid.ColumnDefinitions>
+                            <StackPanel Grid.Column="0" Margin="0,0,8,0">
+                                <TextBlock Text="{x:Static loc:Strings.SettingsDbUser}"
+                                           Foreground="{StaticResource Brush.Text.Secondary}"
+                                           FontSize="12" Margin="0,0,0,4" />
+                                <TextBox Text="{Binding DbUser, UpdateSourceTrigger=PropertyChanged}"
+                                         Background="#1A1A20" Foreground="{StaticResource Brush.Text.Primary}"
+                                         BorderBrush="{StaticResource Brush.Border}" BorderThickness="1" Padding="8" />
+                            </StackPanel>
+                            <StackPanel Grid.Column="1">
+                                <TextBlock Text="{x:Static loc:Strings.SettingsDbPassword}"
+                                           Foreground="{StaticResource Brush.Text.Secondary}"
+                                           FontSize="12" Margin="0,0,0,4" />
+                                <TextBox Text="{Binding DbPassword, UpdateSourceTrigger=PropertyChanged}"
+                                         Background="#1A1A20" Foreground="{StaticResource Brush.Text.Primary}"
+                                         BorderBrush="{StaticResource Brush.Border}" BorderThickness="1" Padding="8"
+                                         FontFamily="Consolas" />
+                            </StackPanel>
+                        </Grid>
+
+                        <TextBlock Text="{x:Static loc:Strings.SettingsDbName}"
+                                   Foreground="{StaticResource Brush.Text.Secondary}"
+                                   FontSize="12" Margin="0,0,0,4" />
+                        <Grid>
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="Auto" />
+                            </Grid.ColumnDefinitions>
+                            <TextBox Grid.Column="0"
+                                     Text="{Binding DbName, UpdateSourceTrigger=PropertyChanged}"
+                                     Background="#1A1A20" Foreground="{StaticResource Brush.Text.Primary}"
+                                     BorderBrush="{StaticResource Brush.Border}" BorderThickness="1" Padding="8"
+                                     FontFamily="Consolas" />
+                            <Button Grid.Column="1" Margin="8,0,0,0"
+                                    Style="{StaticResource SecondaryButton}"
+                                    Content="{x:Static loc:Strings.SettingsTest}"
+                                    Command="{Binding TestDbCommand}"
+                                    IsEnabled="{Binding IsTestingDb, Converter={StaticResource InverseBoolToBool}}" />
+                        </Grid>
+                        <TextBlock Text="{Binding DbConnectionStatus}"
+                                   Foreground="{StaticResource Brush.Text.Secondary}"
+                                   FontSize="12" Margin="0,8,0,0" TextWrapping="Wrap" />
+
+                        <CheckBox IsChecked="{Binding DbAutoApplyMigrations}"
+                                  Margin="0,12,0,0"
+                                  Foreground="{StaticResource Brush.Text.Primary}"
+                                  Content="{x:Static loc:Strings.SettingsDbAutoMigrate}" />
+
+                        <Grid Margin="0,12,0,0">
+                            <Grid.ColumnDefinitions>
+                                <ColumnDefinition Width="*" />
+                                <ColumnDefinition Width="Auto" />
+                            </Grid.ColumnDefinitions>
+                            <TextBlock Grid.Column="0"
+                                       Text="{Binding MigrationsReplayStatus}"
+                                       Foreground="{StaticResource Brush.Text.Secondary}"
+                                       FontSize="12" VerticalAlignment="Center"
+                                       TextWrapping="Wrap" />
+                            <Button Grid.Column="1"
+                                    Style="{StaticResource SecondaryButton}"
+                                    Content="{x:Static loc:Strings.SettingsDbReplay}"
+                                    Command="{Binding ReplayMigrationsCommand}"
+                                    IsEnabled="{Binding IsReplayingMigrations, Converter={StaticResource InverseBoolToBool}}" />
+                        </Grid>
+
+                        <TextBlock Text="{x:Static loc:Strings.SettingsDbHint}"
+                                   Foreground="{StaticResource Brush.Text.Secondary}"
+                                   FontStyle="Italic" FontSize="11" Margin="0,8,0,0"
+                                   TextWrapping="Wrap" />
+                    </StackPanel>
+                </Border>
+
                 <!-- Logs / About -->
                 <Border Background="{StaticResource Brush.Bg.Card}"
                         BorderBrush="{StaticResource Brush.Border}" BorderThickness="1"

src/PSLauncher.Core/Localization/Strings.cs

@@ -138,6 +138,27 @@ public static class Strings
     public static string SettingsInstallation => T("INSTALLATION", "INSTALLATION",   "安装",          "การติดตั้ง",     "التثبيت");
     public static string SettingsCache      => T("CACHE DE TÉLÉCHARGEMENTS", "DOWNLOAD CACHE", "下载缓存", "แคชดาวน์โหลด", "ذاكرة التخزين المؤقت للتنزيلات");
     public static string SettingsLogs       => T("LOGS & APPLICATION", "LOGS & APP",  "日志与应用",     "บันทึกและแอป", "السجلات والتطبيق");
+    public static string SettingsDatabase   => T("BASE DE DONNÉES (XAMPP / MySQL)", "DATABASE (XAMPP / MySQL)", "数据库（XAMPP / MySQL）", "ฐานข้อมูล (XAMPP / MySQL)", "قاعدة البيانات (XAMPP / MySQL)");
+    public static string SettingsDbHost     => T("Hôte",                "Host",                "主机",          "โฮสต์",            "المضيف");
+    public static string SettingsDbPort     => T("Port",                "Port",                "端口",          "พอร์ต",           "المنفذ");
+    public static string SettingsDbUser     => T("Utilisateur",         "User",                "用户",          "ผู้ใช้",           "المستخدم");
+    public static string SettingsDbPassword => T("Mot de passe",        "Password",            "密码",          "รหัสผ่าน",         "كلمة المرور");
+    public static string SettingsDbName     => T("Nom de la base",      "Database name",       "数据库名称",     "ชื่อฐานข้อมูล",     "اسم قاعدة البيانات");
+    public static string SettingsDbAutoMigrate => T(
+        "Appliquer automatiquement les migrations à l'install d'une nouvelle version",
+        "Automatically apply migrations when installing a new version",
+        "安装新版本时自动应用迁移",
+        "ปรับใช้การโยกย้ายโดยอัตโนมัติเมื่อติดตั้งเวอร์ชันใหม่",
+        "تطبيق الترقيات تلقائياً عند تثبيت نسخة جديدة"
+    );
+    public static string SettingsDbReplay   => T("🔁  Rejouer les migrations", "🔁  Replay migrations", "🔁  重新执行迁移", "🔁  เรียกใช้การโยกย้ายอีกครั้ง", "🔁  إعادة تشغيل الترقيات");
+    public static string SettingsDbHint     => T(
+        "Le launcher applique automatiquement les scripts SQL bundled dans _migrations/ de chaque ZIP PROSERVE. Mot de passe stocké chiffré DPAPI.",
+        "The launcher automatically applies SQL scripts bundled in each PROSERVE ZIP's _migrations/ folder. Password stored DPAPI-encrypted.",
+        "启动器自动应用每个 PROSERVE ZIP 的 _migrations/ 文件夹中捆绑的 SQL 脚本。密码使用 DPAPI 加密存储。",
+        "Launcher จะปรับใช้สคริปต์ SQL ที่บรรจุใน _migrations/ ของ ZIP PROSERVE แต่ละชุดโดยอัตโนมัติ รหัสผ่านถูกเก็บแบบเข้ารหัส DPAPI",
+        "يطبق المُشغِّل تلقائياً نصوص SQL المرفقة في _migrations/ لكل ZIP من PROSERVE. كلمة المرور مُخزَّنة بتشفير DPAPI."
+    );
     public static string SettingsLanguage   => T("LANGUE",         "LANGUAGE",       "语言",          "ภาษา",          "اللغة");
     public static string SettingsLanguageHint => T(
         "Le launcher redémarrera pour appliquer le changement.",