Rename imageflow cli tool to something more convenient/shorter

←**imageflow_tool** is a rather long and inconvenient name to type for a cli tool
Would you please at least remove the `_tool` part
→**imageflow**
or maybe even come up with an even more abbreviated name, e.g., _image_ is commonly abbreviated to _img_, so that would make the name
→**imgflow**

The issue identifies the current CLI name as imageflow_tool and suggests imageflow or imgflow. Review the CLI entry point and repository references for the current name, then get agreement on the replacement before changing them. Done means one chosen command name is used consistently and the renamed CLI remains usable.

Written by the indexing model from the issue text.