teevolution: Terra Pro button remap and four onboard banks

[dwei30]

Summary

• Write Terra Pro button assignments as 4-byte key-function records in flash (KeyFunction = 96, button i at 96 + 4*i), matching TeevoLink. Keep at least one Left Click.
• Expose the four firmware profile banks (GetCurrentConfig 0x0e / SetCurrentConfig 0x0f, 0-based 0–3). setProfile is 1-based in the driver, settles, then confirms with GetCurrentConfig.
• readStatus now reports profileCount: 4, 1-based activeProfile, plus buttonMappings / buttonOptions so OpenMouse can show the Profiles UI.

Test plan

• npm test in mouse-protocol (codec + HID tests for remap, last Left Click, and bank switch)
• On a Terra Pro: remap a non-left button, power-cycle, confirm it stuck
• Switch banks 1–4 and confirm DPI / buttons / debounce follow the bank
• Confirm refusing to remap the last Left Click still works