feat(ota): include device SKU in update requests

[chemhack]

Read /etc/jetkvm-sku at startup and pass the value as a sku query parameter when checking for OTA updates, enabling the cloud API to serve variant-specific firmware for jetkvm-v2 (eMMC) and jetkvm-v2-sdmmc hardware. Falls back to "jetkvm-v2" when the file is absent for backwards compatibility.

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Note

Medium Risk
Changes OTA update-check request semantics by adding a new sku query parameter derived from device filesystem state, which could affect update eligibility/targeting if misread or misconfigured. Fallback behavior reduces risk, but cloud/server expectations and rollout should be validated.

Overview
Adds device SKU detection via GetDeviceSKU() (reads /etc/jetkvm-sku, defaults to jetkvm-v2) and threads it through OTA flows.

OTA update URL generation now includes an optional sku query parameter, and all update checks/trigger paths (auto-update loop and RPC-driven status/update calls) populate ota.UpdateParams.SKU so the release API can serve variant-specific firmware.

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