fix: resolve Nginx 503 error on rollback and apply package refactoring

.gitea/workflows/deploy.yml

@@ -92,6 +92,10 @@ jobs:
           
           if [ -z "$IS_TARGET_ALIVE" ]; then
             echo "Health Check Failed! $TARGET container crashed. Rollback."
+            echo "Rolling back Nginx config to $OLD_TARGET..."
+            cp ./nginx/${OLD_TARGET}.conf ./nginx/conf.d/default.conf
+            echo "Restarting Nginx to apply rollback..."
+            docker compose restart nginx || true
             echo "Stopping failed $TARGET containers..."
             docker compose stop gateway-$TARGET tool-sms-$TARGET tool-email-$TARGET tool-other-$TARGET tool-payment-$TARGET
             exit 1 # 파이프라인 실패 처리 (구버전은 그대로 유지됨)