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.Core/Localization/Strings.cs

@@ -401,6 +401,30 @@ public static class Strings
         $"🔍 التحقق من SHA-256 v{version}: {percent}%"
     );
 
+    // ==================== DB MIGRATIONS ====================
+    public static string StatusApplyingMigrations(string version) => T(
+        $"Application des migrations base de données v{version}…",
+        $"Applying database migrations for v{version}…",
+        $"正在应用 v{version} 的数据库迁移…",
+        $"กำลังปรับใช้การโยกย้ายฐานข้อมูล v{version}…",
+        $"جارٍ تطبيق ترقيات قاعدة البيانات v{version}…"
+    );
+    public static string ProgressMigration(int done, int total, string filename) => T(
+        $"🗄 Migration {done}/{total} : {filename}",
+        $"🗄 Migration {done}/{total}: {filename}",
+        $"🗄 迁移 {done}/{total}：{filename}",
+        $"🗄 การโยกย้าย {done}/{total}: {filename}",
+        $"🗄 الترقية {done}/{total}: {filename}"
+    );
+    public static string MsgBoxMigrationFailed => T("Migration DB échouée", "DB migration failed", "数据库迁移失败", "การโยกย้าย DB ล้มเหลว", "فشل ترقية قاعدة البيانات");
+    public static string MsgMigrationFailed(string detail) => T(
+        $"Une migration de la base de données a échoué :\n\n{detail}\n\nLa version a été extraite mais la base n'a PAS été modifiée (rollback automatique).\nVérifie que XAMPP est démarré et que les paramètres de connexion sont corrects (Settings → Base de données), puis clique « Rejouer les migrations » dans Settings.",
+        $"A database migration failed:\n\n{detail}\n\nThe version was extracted but the database was NOT modified (automatic rollback).\nMake sure XAMPP is running and the connection settings are correct (Settings → Database), then click « Replay migrations » in Settings.",
+        $"数据库迁移失败：\n\n{detail}\n\n版本已解压，但数据库未被修改（自动回滚）。\n请确保 XAMPP 正在运行并且连接设置正确（设置 → 数据库），然后点击设置中的「重新执行迁移」。",
+        $"การโยกย้ายฐานข้อมูลล้มเหลว:\n\n{detail}\n\nเวอร์ชันถูกแตกแล้วแต่ฐานข้อมูลไม่ถูกแก้ไข (rollback อัตโนมัติ)\nตรวจสอบว่า XAMPP กำลังทำงานและการตั้งค่าการเชื่อมต่อถูกต้อง (ตั้งค่า → ฐานข้อมูล) จากนั้นคลิก « เรียกใช้การโยกย้ายอีกครั้ง » ในการตั้งค่า",
+        $"فشلت ترقية قاعدة البيانات:\n\n{detail}\n\nتم استخراج النسخة لكن قاعدة البيانات لم تُعدَّل (rollback تلقائي).\nتأكد من تشغيل XAMPP وأن إعدادات الاتصال صحيحة (الإعدادات → قاعدة البيانات)، ثم انقر « إعادة تشغيل الترقيات » في الإعدادات."
+    );
+
     public static string StatusPreparingDownload(string version) => T(
         $"Préparation du téléchargement v{version}…",
         $"Preparing download for v{version}…",