* Support running as a Windows service.
* Optimize startup logic contro
* When running in a Windows service environment, delegate the termination of the program to the win_service_event_loop function.
* Remove the use of std::ffi::OsString at the top.
* Support service manager
* Move the service-related features to be implemented in easytier-cli.
* Add a command line option work-dir to specify the working directory
Adjust the error handling logic
Luna Yao