Fixed 5 hardcoded Chinese error messages to support bilingual display:
Backend changes (services):
- provider.rs: Fixed 4 error messages:
* Data format error when deserializing array (line 731)
* Data format error when deserializing single object (line 738)
* Regex initialization failure (line 1163)
* App type not found (line 1191)
- speedtest.rs: Fixed 1 error message:
* HTTP client creation failure (line 104)
All errors now use AppError::localized to provide both Chinese and English messages.
Impact:
- Users will now see properly localized error messages when testing usage scripts
- Error messages respect the application language setting
- Better user experience for English-speaking users
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