通过对 opencode 启动命令行添加参数 --log-level DEBUG，得到以下日志：

error: Executable not found in $PATH: "xdg-open"
      path: "xdg-open",
     errno: -2,
   syscall: "spawn xdg-open",
 spawnargs: [ "http://localhost:14096" ],
      code: "ENOENT"

      at spawn (node:child_process:667:35)
      at spawn (node:child_process:14:39)
      at 
<anonymous> (/$bunfs/root/chunk-m0dweyng.js:2:3353)

很明显 opencode 尝试调用 GUI 环境相关的命令，但这是个无头环境，相关 issue：#31815 : opencode web shows ENOENT: xdg-open error in container environments，快速解决方案来自：31815#issuecomment-4706666875，即，运行以下命令即可：

sudo touch /usr/local/bin/xdg-open
sudo chmod +x /usr/local/bin/xdg-open