Add NuPhy Air V2 keyboard support

[gabrielpopa]

Summary

Adds OpenRGB support for the NuPhy Air60 V2, Air75 V2, and Air96 V2 keyboards using their stock QMK/VIA firmware.

Features

• Detects supported NuPhy Air V2 keyboards over VIA raw HID
• Controls RGB Matrix effects
• Supports static color, brightness, and effect speed
• Saves lighting settings to the keyboard
• Verifies VIA RGB Matrix support before registering the device

Limitations

NuPhy’s stock firmware does not expose direct per-key RGB control or the separate side-light bars through VIA. OpenRGB therefore controls whole-keyboard RGB Matrix effects only.

Validation

• OpenRGB builds successfully
• Physically tested with a connected NuPhy Air75 V2
• Verified device detection
• Verified static red color and brightness control using stock firmware

On Linux, install a udev rule so OpenRGB can access the keyboard after reconnecting or changing USB ports:

echo 'SUBSYSTEM=="hidraw", ATTRS{idVendor}=="19f5", ATTRS{idProduct}=="3246", TAG+="uaccess"' |
sudo tee /etc/udev/rules.d/61-openrgb-nuphy-air75-v2.rules

sudo udevadm control --reload-rules

Unplug and reconnect the keyboard, then confirm detection:

./build/openrgb --list-devices

Test static red lighting:

./build/openrgb --device "NuPhy Air75 V2" --mode static --color FF0000 --brightness 100

Expected result: the keyboard appears as NuPhy Air75 V2 and its main key lighting turns solid red. The separate side-light bars are not exposed through stock VIA firmware.