- Add IUtf8ToAsciiConverter as constructor parameter to DefaultShortStringHelper
- Register ICharacterMappingLoader and IUtf8ToAsciiConverter as singletons in DI
- Add internal Instance property to Utf8ToAsciiConverterStatic for test compatibility
- Update 12 test files to pass converter instance
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Co-Authored-By: Claude <noreply@anthropic.com>