Update deployment scripts with Node.js path fixes and data preservation

- Modified deploy-to-nas.sh to use vibsin9322 account
- Added Node.js path detection for Synology NAS
- Fixed npm command paths to use full Node.js path
- Added database backup and preservation logic
- Created manual deployment guide and SSH helper scripts

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

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

ssh-connect.sh

@@ -0,0 +1,12 @@
+#!/bin/bash
+
+# SSH 연결 헬퍼 스크립트
+NAS_IP="${1:-119.64.1.86}"
+NAS_USER="${2:-vibsin9322}"
+COMMAND="${3:-echo 'SSH 연결 성공'}"
+
+# 비밀번호를 입력받아 SSH 연결
+echo "🔑 SSH 연결 시도: $NAS_USER@$NAS_IP:2222"
+echo "📝 비밀번호를 입력하세요:"
+
+ssh -p 2222 -o StrictHostKeyChecking=no "$NAS_USER@$NAS_IP" "$COMMAND"