Adds config_rrgv4.21128.json targeting the latest Iceman release
(v4.21128 Permafrost, 2026-02-25). Based on config_rrgv4.16717.json
with the following updates:
- Add hf mf autopwn command (primary attack workflow since ~v4.14000)
- Add hf mf fchk (fast key check) as default check command
- Update config.qrc to include the new config file
Addresses issues #65, #68, #38 (command syntax out of date with Iceman).
