aui.boot breaks on Windows if user folder is in Russian

```
FAILED: bin/aui.core.dll lib/aui.core.lib
C:\Windows\system32\cmd.exe /C "cd . && "C:\Program Files\JetBrains\CLion 2025.3\bin\cmake\win\x64\bin\cmake.exe" -E vs_link_dll --msvc-ver=1950 --intdir=aui.core\CMakeFiles\aui.core.dir --rc=C:\PROGRA~2\WI3CF2~1\10\bin\100261~1.0\x64\rc.exe --mt=C:\PROGRA~2\WI3CF2~1\10\bin\100261~1.0\x64\mt.exe --manifests -- C:\PROGRA~1\MIB055~1\18\COMMUN~1\VC\Tools\MSVC\1450~1.357\bin\Hostx64\x64\link.exe /nologo @CMakeFiles\aui.core.rsp /out:bin\aui.core.dll /implib:lib\aui.core.lib /pdb:bin\aui.core.pdb /dll /version:0.0 /machine:x64 /debug /INCREMENTAL /force:MULTIPLE && cd ."
LINK Pass 1: command "C:\PROGRA~1\MIB055~1\18\COMMUN~1\VC\Tools\MSVC\1450~1.357\bin\Hostx64\x64\link.exe /nologo @CMakeFiles\aui.core.rsp /out:bin\aui.core.dll /implib:lib\aui.core.lib /pdb:bin\aui.core.pdb /dll /version:0.0 /machine:x64 /debug /INCREMENTAL /force:MULTIPLE /MANIFEST /MANIFESTFILE:aui.core\CMakeFiles\aui.core.dir/intermediate.manifest aui.core\CMakeFiles\aui.core.dir/manifest.res" failed (exit code 1181) with the following output:

LINK : warning LNK4075: не учитывается "/INCREMENTAL" из-за спецификации "/FORCE"

LINK : fatal error LNK1181: не удается открыть входной файл "C:\Users\Р'Р?Р'Р?Р?\.aui\prefix\zlib\d24b25d74387d0c78062e544470cc162\lib\zlibd.lib"
```

The actual location of `~/.aui` is `C:\Users\БИБОН\.aui\`.

I suppose CJK symbols would break build either. (users of #508)

If `v8.0.0-rc.12` is specified, the build is ok. That's because aui.boot would just download precompiled binary of aui, instead of building it locally.

Reproduce the local build on Windows with a Russian-named user folder, using the failing aui.boot path rather than v8.0.0-rc.12. Start by tracing how aui.boot passes the ~/.aui\prefix\zlib path into CMake and the linker; done means the local build succeeds with Cyrillic paths, including the zlib library lookup.

Written by the indexing model from the issue text.