polyfill 2

LAN / remote access support for the DeepSeek Harness Web UI: self-contained 0.0.0.0 binding, automatic /api trust-fence widening (LAN + Tailscale 100.x + VPN IPv4), and a crypto.randomUUID polyfill on plain-HTTP origins.

DSH 浏览器兼容补丁：AbortSignal.timeout/any 兼容 + 慢隧道超时放宽。老手机浏览器必备。