Fix raytrace asset basis and atlas updates

[anirul]

Summary

• add optional asset_front / asset_up fields to NodeMesh and preserve them during scene serialization
• apply asset-basis correction in the Vulkan glTF scene loader so meshes with different local front/up conventions can face Frame's +X/+Y basis through JSON
• wrap raytracing atlas UVs instead of clamping tiled UVs, and fix dynamic/skinned BLAS update geometry pointers/max vertex values

Verification

• cmake --build build\windows --config Debug --target grpcmmo_client -- /m:1
• ctest --test-dir build\windows -C Debug -R grpcmmo_client_tests --output-on-failure
• Vulkan/raytrace client screenshot run with skinned CesiumMan mesh and tiled ground texture