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/SettingsIndexPageClient.tsx

@@ -50,10 +50,17 @@ export function SettingsIndexPageClient({ initialPreferences, initialSystemInfo
     setIsBackupLoading(true);
     try {
       const backup = await backupClient.createBackup();
-      setMessages(prev => ({
-        ...prev,
-        backup: { type: 'success', text: `Sauvegarde créée: ${backup.filename}` }
-      }));
+      if (backup) {
+        setMessages(prev => ({
+          ...prev,
+          backup: { type: 'success', text: `Sauvegarde créée: ${backup.filename}` }
+        }));
+      } else {
+        setMessages(prev => ({
+          ...prev,
+          backup: { type: 'success', text: 'Sauvegarde sautée: aucun changement détecté' }
+        }));
+      }
       
       // Recharger les infos système pour mettre à jour le nombre de sauvegardes
       loadSystemInfo();