Wii first-run bootstrap payload

This directory contains the small shared2/wc24 first-run tree needed when Mario Kart Wii is launched directly without an imported Wii NAND. The runtime copies these files only into a newly managed, per-user NAND and never overwrites an existing profile.

The layout and required files follow Dolphin's direct-disc Wii bootstrap: Source/Core/Core/WiiRoot.cpp and Data/Sys/Wii/shared2/wc24.