feat: implement HID++ 2.0 feature discovery for G923 Xbox LEDs

Replaces blind legacy probe with proper HID++ 2.0 protocol:
- Queries IRoot/IFeatureSet to enumerate all device features
- Logs complete feature table for diagnostics
- Probes discovered LED features with multiple command formats
- Falls back to legacy [F8 12] for G29/G920/G923-PS
- Uses overlapped I/O for HID read during discovery

Author: privaloops