Add functions to Panda Power

Hello,

A valuable improvement this equipment could have would be a “**Running Time since last usage reset**” feature that accounts only for the actual operating time, excluding any standby or idle periods. Additionally, it would be very useful if the device could generate a **usage report directly from the Panda Power**, downloadable in **CSV** or **another standard file format**.

This would greatly improve transparency when billing clients. In my printing workflows, I typically invoice based on the following criteria: kind of filament and quantity, energy consumption (currently estimated), part development (when I am responsible for the design), and equipment usage (time).

The issue mentions Panda Power and requests operating-time tracking plus downloadable usage reports in CSV or another standard format. No files, tests, or entry points are identified, so first determine where device runtime and report generation are implemented. Done would require agreed behavior for reset handling, idle-time exclusion, report fields, and output format.

Written by the indexing model from the issue text.