Add environment variable example and update .gitignore

- Created a new .env.example file to provide a template for environment variables, including database connection details, JWT settings, encryption keys, and external API keys.
- Updated .gitignore to include additional test output directories and archive files, ensuring that unnecessary files are not tracked by Git.
- Removed outdated approval test reports and scripts that are no longer needed, streamlining the project structure.

These changes improve the clarity of environment configuration and maintain a cleaner repository.

scripts/dev/start-all-parallel.ps1

@@ -150,7 +150,7 @@ Write-Host "============================================" -ForegroundColor Cyan
 Write-Host "[완료] 모든 서비스가 시작되었습니다!" -ForegroundColor Green
 Write-Host "============================================" -ForegroundColor Cyan
 Write-Host ""
-Write-Host "[DATABASE] PostgreSQL: http://39.117.244.52:11132" -ForegroundColor White
+Write-Host "[DATABASE] PostgreSQL: http://211.115.91.141:11134" -ForegroundColor White
 Write-Host "[BACKEND]  Node.js API: http://localhost:8080/api" -ForegroundColor White
 Write-Host "[FRONTEND] Next.js:     http://localhost:9771" -ForegroundColor White
 Write-Host ""