fix: add Redis password authentication support in health check

The health check script was not using the REDIS_HOST_PASSWORD environment
variable when checking Redis connectivity, causing failures when Redis is
password-protected. Now properly detects and uses the password from .env
when available.

Also includes minor cleanup in backup.sh (formatting and redundant log removal).

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

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

scripts/check-health.sh

@@ -152,10 +152,18 @@ echo ""
 
 # 6. Vérifier Redis
 echo "▶ Cache Redis:"
-if docker-compose exec -T redis redis-cli ping 2>/dev/null | grep -q "PONG"; then
-  check_ok "Redis répond"
+if [ -n "${REDIS_HOST_PASSWORD:-}" ]; then
+  if docker-compose exec -T redis redis-cli -a "$REDIS_HOST_PASSWORD" ping 2>/dev/null | grep -q "PONG"; then
+    check_ok "Redis répond (avec authentification)"
+  else
+    check_fail "Redis ne répond pas ou mot de passe incorrect"
+  fi
 else
-  check_fail "Redis ne répond pas"
+  if docker-compose exec -T redis redis-cli ping 2>/dev/null | grep -q "PONG"; then
+    check_ok "Redis répond (sans authentification)"
+  else
+    check_fail "Redis ne répond pas"
+  fi
 fi
 
 echo ""