krakrukra/PocketAdmin — reverse-engineered prompt

Build me a complete open source PocketAdmin style USB tool for my own lab and authorized sysadmin work. I want it to look like a small flash drive, show up as a keyboard, mouse, and optional storage device, and type a text payload automatically when plugged in. It should read plain Ducky Script style text files directly from onboard storage, let me keep different startup payloads for different operating systems, and let me run saved payloads on demand by tapping Caps Lock a chosen number of times.

Please include the C firmware, build steps, and hardware design files so I can manufacture or modify the board. I also want simple configuration files for serial number, USB IDs, keyboard layout, storage visibility, read only mode, and fake capacity. Add a safe mass storage only button mode so it never types by accident while I’m editing payloads. Keep the docs practical, with clear flashing instructions and safety notes for authorized use only.