- ci.yml: add web build step + upload .next as artifact
- deploy.yml: download artifact via SCP, copy to VPS .next dir
(no bun run build on VPS — only git pull + install + index + restart)
- Bump actions/checkout@v4 → @v5 (Node 20 deprecation)
- Revert next.config standalone mode (not needed for .next/ copy approach)
- Remove broken bun --cwd (doesn't support --cwd flag)