fix: preserve Unicode in process command lines

[tuna4ll]

Summary

Fixes Unicode handling for process command lines returned by getProcessList.

Windows exposes process command lines as UTF-16. The native code previously
converted them with the active Windows ANSI code page (CP_ACP), but the
resulting std::string is passed to N-API as UTF-8. Characters outside the
active code page could therefore be replaced or decoded incorrectly.

This change:

• converts command lines from UTF-16 to UTF-8 using CP_UTF8
• adds a regression test covering Turkish, Cyrillic, and Chinese characters

Testing

• npm run compile
• npm run lint
• git diff --check
• npm test

Fixes #76

[tuna4ll]

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