Add internationalized XML documentation comments to test class

[konard]

Summary

• Added bilingual XML documentation comments (English and Russian) to the UniqueTimestampFactoryTests class and its test method
• Followed the established pattern used throughout the linksplatform organization with <para> tags for each language
• Completed internationalization of code comments in the repository, as all main library classes already had proper bilingual documentation

Changes Made

• Added XML documentation to UniqueTimestampFactoryTests class with both English and Russian descriptions
• Added XML documentation to UniqueTimestampTest() method with bilingual descriptions
• Maintained consistency with existing code style and documentation patterns

Test Plan

• Project builds successfully without errors
• All existing tests continue to pass
• XML documentation is properly generated with bilingual content
• Code follows linksplatform documentation standards

🤖 Generated with Claude Code

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Resolves #15