[kyoungbinkim]

What & why

Add a Korean translation of the root README so Korean-speaking users can read the project overview and setup instructions. Add the Korean language link to each existing root README.

Area

• Other (README translations)

How was it tested?

• Compared the Korean README against the English README, including all five fenced code blocks and relative file links.
• git diff --cached --check passed.
• Windows CPU: cmake --preset cpu and cmake --build --preset cpu passed.
• ctest --preset cpu -L "L0|L1" --output-on-failure did not pass: multiple checks could not run because uv was unavailable, and moe_test_platform_ios_cleanup failed because Windows denied the directory symlink privilege.

Checklist

• ctest --preset cpu -L "L0|L1" passes locally in edge0-infer/ (engine changes)
• Ran the higher test levels this change affects (see edge0-infer/docs/testing.md)
• Added/updated tests for new behavior
• Updated relevant docs / READMEs (incl. translations if user-facing)