v0.13.0 — Report tool : timestamped backups + manual revert

The previous deploy mechanism kept the old version under {target}.old
just long enough to swap, then deleted it — no way back if the new
report had a runtime bug only visible at use time.

Now each deploy keeps the previous active version under
{FolderName}.backup-yyyyMMdd-HHmmss/. The N most recent are kept
(MaxBackups, default 3) and older ones are pruned in best-effort.

UI in Settings → Avancés → Outil Report :
- "Conserver N backups" input (0 = no history, back to v0.12 behavior)
- List of backups with date + size + cryptic folder name + per-row "↶ Revert"
- Confirmation dialog: "Revert to {date}? The currently deployed
  version will itself be saved as a new backup, so you can switch back."

Implementation
- IReportToolDeployer: + ListBackupsAsync, + RevertAsync, + BackupInfo,
  + DeployStatus.BackupNotFound.
- ReportToolDeployer: deploy renames {target} → backup-{ts}; PruneOldBackups
  trims to MaxBackups; RevertAsync atomically swaps current ↔ chosen
  backup, the previous current becoming itself a fresh backup.
- ReportBackupViewModel + DataTemplate for the list rows.
- Strings: backup labels, "↶ Revert", confirmation message.

Caveats documented in the design discussion:
- Backups cover ONLY the report tool files. DB migrations are not reverted
  (irreversible). If a migration broke the schema, that's a separate fix.
- No HTTP-HEAD post-deploy auto-revert: too fragile for false positives.
  Revert stays a deliberate manual action.

Versions bumped to 0.13.0.

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

src/PSLauncher.Core/Localization/Strings.cs

@@ -511,6 +511,36 @@ public static class Strings
         "نشر أداة التقارير تلقائياً عند تثبيت نسخة جديدة"
     );
     public static string SettingsReportRedeploy   => T("📂  Re-déployer le Report maintenant", "📂  Re-deploy Report now", "📂  立即重新部署报告", "📂  ปรับใช้รายงานใหม่เดี๋ยวนี้", "📂  إعادة نشر التقرير الآن");
+
+    // ---- Backups Report tool ----
+    public static string SettingsReportBackups       => T("Backups disponibles", "Available backups", "可用备份", "สำรองข้อมูลที่มี", "النسخ الاحتياطية المتاحة");
+    public static string SettingsReportMaxBackups    => T("Conserver N backups", "Keep N backups", "保留 N 个备份", "เก็บสำรอง N ชุด", "الاحتفاظ بـ N نسخة احتياطية");
+    public static string SettingsReportRevert        => T("↶  Revert", "↶  Revert", "↶  还原", "↶  ย้อนกลับ", "↶  استرجاع");
+    public static string SettingsReportNoBackups     => T(
+        "Aucun backup pour l'instant. Le premier sera créé au prochain deploy.",
+        "No backups yet. The first one will be created on the next deploy.",
+        "暂无备份。下次部署时将创建第一个。",
+        "ยังไม่มีสำรองข้อมูล จะสร้างครั้งแรกในการปรับใช้ครั้งถัดไป",
+        "لا توجد نسخ احتياطية بعد. سيتم إنشاء أول نسخة عند النشر التالي."
+    );
+    public static string SettingsReportBackupSize(string size) => T(
+        $"taille : {size}", $"size: {size}", $"大小：{size}", $"ขนาด: {size}", $"الحجم: {size}"
+    );
+    public static string MsgBoxRevertReport          => T("Revert Outil Report", "Revert Report tool", "还原报告工具", "ย้อนกลับเครื่องมือรายงาน", "استرجاع أداة التقارير");
+    public static string MsgRevertReportConfirm(string date) => T(
+        $"Revenir à la version du {date} ?\n\nLa version actuellement déployée sera elle-même sauvegardée comme nouveau backup, donc tu pourras y revenir si besoin.",
+        $"Revert to the version from {date}?\n\nThe currently deployed version will itself be saved as a new backup, so you can switch back if needed.",
+        $"还原到 {date} 的版本？\n\n当前已部署的版本将作为新备份保存，因此您可以在需要时切换回去。",
+        $"ย้อนกลับไปยังเวอร์ชันของ {date}?\n\nเวอร์ชันที่ปรับใช้อยู่ในปัจจุบันจะถูกบันทึกเป็นสำรองใหม่ ดังนั้นคุณสามารถสลับกลับได้หากต้องการ",
+        $"العودة إلى نسخة {date}؟\n\nسيتم حفظ النسخة المنشورة حالياً كنسخة احتياطية جديدة، لذا يمكنك التبديل إليها إذا لزم الأمر."
+    );
+    public static string MsgRevertReportSuccess(string date) => T(
+        $"✓ Reverted vers la version du {date}",
+        $"✓ Reverted to version from {date}",
+        $"✓ 已还原到 {date} 的版本",
+        $"✓ ย้อนกลับเป็นเวอร์ชันของ {date} แล้ว",
+        $"✓ تم الاسترجاع إلى نسخة {date}"
+    );
     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.",