feat: enhance backup functionality and logging

- Updated `createBackup` method to accept a `force` parameter, allowing backups to be created even if no changes are detected.
- Added user alerts in `AdvancedSettingsPageClient` and `BackupSettingsPageClient` for backup status feedback.
- Implemented `getBackupLogs` method in `BackupService` to retrieve backup logs, with a new API route for accessing logs.
- Enhanced UI in `BackupSettingsPageClient` to display backup logs and provide a refresh option.
- Updated `BackupManagerCLI` to support forced backups via command line.

components/settings/AdvancedSettingsPageClient.tsx

@@ -43,10 +43,16 @@ export function AdvancedSettingsPageClient({
   const handleCreateBackup = async () => {
     setIsCreatingBackup(true);
     try {
-      await backupClient.createBackup();
+      const result = await backupClient.createBackup();
+      if (result === null) {
+        alert('⏭️ Sauvegarde sautée : aucun changement détecté');
+      } else {
+        alert('✅ Sauvegarde créée avec succès');
+      }
       await reloadBackupData();
     } catch (error) {
       console.error('Failed to create backup:', error);
+      alert('❌ Erreur lors de la création de la sauvegarde');
     } finally {
       setIsCreatingBackup(false);
     }