fix: prevent spurious N/A output in health check

Fixed issue where "N/A" was being printed directly to stdout instead of
being captured in variables when du commands partially failed.

Changed from:
DATA_SIZE=$(du -sh ./data 2>/dev/null | cut -f1 || echo "N/A")

To:
DATA_SIZE=$(du -sh ./data 2>/dev/null | cut -f1)
if [ -z "$DATA_SIZE" ]; then
  DATA_SIZE="N/A"
fi

This prevents spurious "N/A" lines appearing in the health check output.

Fixed for:
- DATA_SIZE (data directory size)
- DB_SIZE (database directory size)
- LOGS_SIZE (logs directory size)

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

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

scripts/check-health.sh

@@ -176,12 +176,18 @@ fi
 
 # Vérifier la taille des données
 if [ -d ./data ]; then
-  DATA_SIZE=$(du -sh ./data 2>/dev/null | cut -f1 || echo "N/A")
+  DATA_SIZE=$(du -sh ./data 2>/dev/null | cut -f1)
+  if [ -z "$DATA_SIZE" ]; then
+    DATA_SIZE="N/A"
+  fi
   check_ok "Taille des données: $DATA_SIZE"
 fi
 
 if [ -d ./db ]; then
-  DB_SIZE=$(du -sh ./db 2>/dev/null | cut -f1 || echo "N/A")
+  DB_SIZE=$(du -sh ./db 2>/dev/null | cut -f1)
+  if [ -z "$DB_SIZE" ]; then
+    DB_SIZE="N/A"
+  fi
   check_ok "Taille de la base: $DB_SIZE"
 fi
 
@@ -233,7 +239,10 @@ if [ -d ./logs ]; then
   LOG_COUNT=$(find ./logs -type f 2>/dev/null | wc -l)
   check_ok "$LOG_COUNT fichier(s) de log"
 
-  LOGS_SIZE=$(du -sh ./logs 2>/dev/null | cut -f1 || echo "N/A")
+  LOGS_SIZE=$(du -sh ./logs 2>/dev/null | cut -f1)
+  if [ -z "$LOGS_SIZE" ]; then
+    LOGS_SIZE="N/A"
+  fi
   check_ok "Taille des logs: $LOGS_SIZE"
 else
   check_warn "Dossier de logs introuvable"