admin
1242d07db0
fix(实例代理): 冷启动窗口转发失败改为 503，消除实例子域 502（档案 141）
根因：proxyHttp() 在转发两次失败后 reply.raw.destroy()，不写任何响应头与 body，边缘 nginx 只能回 502。
现象：admin 首次用 admin.ai1net.com 进场即 502 —— /api/dsh/enter 拉起实例后 12 秒访问，实例进程已在、端口已分配但 dsh 尚未监听。
改法：新增 replyUpstreamUnavailable()，响应头未发出时回 503 + Retry-After（导航请求给会自动重试的极简 HTML），仅 headersSent/writableEnded 才允许 destroy。
实测：门户 200 / admin.ai1net.com 401 / 实例端口 401 / 启动日志 0 error / verify-inject 全绿。
2026-09-19 16:18:41 +08:00
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