Add Keychron Nape Pro layer remaps and per-layer orientation

[dwei30]

Summary

• Add Nape Pro VIA keymap get/set: packed GET_BUFFER (cmd 18), SET_KEYCODE (cmd 5), and independent encoder CCW/CW (GET_ENCODER 20 / SET_ENCODER 21). Overlay keys are 01 / 02 / 03 / 04 / M1 / M2; unlabeled column 6 stays hidden.
• Treat firmware layers as 1–8 (same index as GET_CURRENT_LAYER and Keychron Launcher). UI labels stay 0–7. VIA may report a spare slot at index 0; OpenMouse caps at 8.
• Add per-layer sensor orientation: GET_LAYER_ORI 56 / SET_LAYER_ORI 57 as [167, 57, layer, index], plus live SET_ORI 52 when writing the active layer. Eight 45° steps (0°–315°).
• Keep this driver Nape-only (nape-hid.ts, KEYCHRON_NAPE_*). M-series Keychron mice use a different protocol and should not reuse these helpers.

Test plan

• npm run check in mouse-protocol
• Wired Nape Pro (3434:0440, firmware v1.2.6-ZK): readLayerKeymap matches Launcher for the current layer
• setKeycode / setEncoder confirm on readback; CW and CCW can differ
• Layer 3 remap hits GET_BUFFER offset 14 * 3 (0x2A), not layer-minus-one
• setLayerOrientation(3, 5) stores 225° on layer 3 and leaves other layers unchanged
• Writing orientation on the active layer also updates live GET_ORI
• Link-KM receiver still rejects a non-Nape pairing