Root cause: deploy workflow only deleted zhuyuan-server before PM2 restart,
leaving zhuyuan-preview in errored state. Since guanghulab.online is the
preview domain (Nginx §2 → port 3801), requests to /api/* got 502.
Fix: delete BOTH zhuyuan-server AND zhuyuan-preview before pm2 start.
Add health check for port 3801 to detect this failure in future deploys.
Agent-Logs-Url: https://github.com/qinfendebingshuo/guanghulab/sessions/04495ae8-6c76-4458-bbb0-262e3205dccd
Co-authored-by: qinfendebingshuo <207279273+qinfendebingshuo@users.noreply.github.com>
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