Japanese device names are displayed as garbled text (UTF-8 encoding issue)

[ruticejp]

Japanese device names are displayed as garbled text (UTF-8 encoding issue)

Description:
On Japanese Windows, audio device names (such as スピーカー, マイク) are shown as unreadable, garbled text in the FlexASIO GUI.
This is caused by incorrect handling of UTF-8 encoded strings from the PortAudio library.

Steps to Reproduce:

1. Run FlexASIO GUI v0.35 on a Japanese Windows environment.
2. Select an audio device with a Japanese name.
3. The device name appears as mojibake (garbled text) in the UI.

Expected Behavior:
Japanese device names should be displayed correctly.

Environment:

• OS: Windows 11 Enterprise Build 26200.7171 (Japanese locale)
• FlexASIO GUI version: v0.35
• PortAudio library: version unknown (not found in DLL)

Additional Notes:
This issue affects all device names containing non-ASCII characters.

Related Issue:

• FlexASIO_GUI Issue #38