Add non-root Docker user support with automatic command setup (#2830)

* Initial plan

* Add non-root user guide and improve error messages

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add PM2_HOME configuration to fix non-root user permission errors

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Fix PM2 socket error by using /tmp for PM2_HOME instead of mounted volume

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Document symlink permission limitation for non-root users

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Clarify that scheduled tasks auto-adapt to use full paths when symlinks unavailable

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add error handling for symlink creation to prevent worker crashes

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Add practical solutions for non-root users to use ql and task commands

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* Modify linkCommand to create symlinks in ~/bin for non-root users

Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>

* 修复链接 task 命令

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: whyour <22700758+whyour@users.noreply.github.com>
Co-authored-by: whyour <imwhyour@gmail.com>

README.md

@@ -43,6 +43,8 @@ Timed task management platform supporting Python3, JavaScript, Shell, Typescript
 
 `latest` 镜像是基于 `alpine` 构建，`debian` 镜像是基于 `debian-slim` 构建。如果需要使用 `alpine` 不支持的依赖，建议使用 `debian` 镜像
 
+**⚠️ 重要提示**: 如果您需要以**非 root 用户**运行 Docker，请使用 `debian` 镜像。Alpine 的 `crond` 需要 root 权限。
+
 ```bash
 docker pull whyour/qinglong:latest
 docker pull whyour/qinglong:debian