[Fixed]-Django: is there a way to 'import' functionality from admin site?

Sure you can get all the functionality that Django admin has.

1. That’s how actions history is displayed in template: link. This what action_list is, that is rendered in template: link. And finally, LogEntry model is fully described in django.contrib.admin.models.
2. As the first point is described, you can find the information about authentication, as @user2976657 pointed you can find it in the docs, or run through source code