Show backup size instead of repository in success notifications

Replace repository path with backup size in ntfy success notifications to
provide more useful information about backup completion.

Changes:
- Add backup size retrieval using borgmatic info command
- Display original size in notification instead of repository path
- Fallback to "taille inconnue" if size cannot be determined

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

hooks/ntfy-success.sh

@@ -16,6 +16,12 @@ if [ -z "$ARCHIVE_NAME" ]; then
     ARCHIVE_NAME="dernière archive"
 fi
 
+# Récupérer la taille du backup
+BACKUP_SIZE=$(borgmatic info --archive "$ARCHIVE_NAME" 2>/dev/null | grep -E "Original size|This archive" | head -1 | awk '{print $(NF-1), $NF}')
+if [ -z "$BACKUP_SIZE" ]; then
+    BACKUP_SIZE="taille inconnue"
+fi
+
 # Envoyer notification de succès
 curl -s -u "$NTFY_USER" \
     -H "Title: ✅ Backup réussi" \
@@ -24,7 +30,7 @@ curl -s -u "$NTFY_USER" \
     -d "Backup terminé avec succès.
 Archive: ${ARCHIVE_NAME}
 Date: $(date '+%Y-%m-%d %H:%M:%S')
-Repository: ${BORG_REPO}" \
+Taille: ${BACKUP_SIZE}" \
     "$NTFY_URL"
 
 echo "Notification de succès envoyée à ntfy"