Longbridge CLI watchlist group names appear to fail when using Chinese characters.

[zhhbinn]

Longbridge CLI watchlist group names appear to fail when using Chinese characters.

Repro:

longbridge watchlist create "测试-雷达临时" --format json

returns:

Error: API error (code 500000): internal error

Creating an English group works:

longbridge watchlist create "RadarTempRenameTest" --format json

but renaming it to Chinese also fails:

longbridge watchlist update <group_id> --name "测试-雷达临时" --format json

with the same 500000 internal error.

Expected behavior: watchlist group names should support Chinese characters, or return a clear validation error if unsupported.