Add board support: NOMADSTAR_METEOR_PRO (hwModel 96)

[jamesarich]

Meshtastic-Android's own bootloader-OTA quirks manifest (androidApp/src/main/assets/device_bootloader_ota_quirks.json) flags NOMADSTAR_METEOR_PRO (hwModel 96, PlatformIO target rak4631_nomadstar_meteor_pro) as requiresBootloaderUpgradeForOta: true, but there's no corresponding board in src/boards/ here — it's RAK4631-based but tracked as a distinct hwModel from plain RAK4631 (already supported), so it's not safe to assume it can just reuse wiscore_rak4631_board's UF2 as-is.

Reference: https://github.com/meshtastic/Meshtastic-Android/blob/main/androidApp/src/main/assets/device_bootloader_ota_quirks.json

Needs someone with the physical hardware to confirm whether it can reuse the existing RAK4631 board port or needs its own src/boards/ entry.

[jamesarich]

Draft finding up: #23. Diffed this board's firmware variant against plain RAK4631's — the only differences are peripheral-level (RGB LED chip, sensor I2C, buzzer), nothing this bootloader touches. Likely resolution is "no new board port needed, wiscore_rak4631_board's UF2 should already work" — but that's not confirmed on real hardware yet. If anyone has this device, flashing the existing RAK4631 UF2 and reporting back would close this out.