Add comprehensive XML documentation to ILinksExtensions class

[konard]

Summary

Comprehensive XML documentation has been added to the ILinksExtensions class, completing the documentation requirements for the high-priority file mentioned in issue #166.

Key Improvements

• ✅ Complete documentation coverage: All 71 public extension methods now have meaningful XML documentation
• ✅ Replaced auto-generated content: Removed generic <para>The link.</para> placeholders with detailed descriptions
• ✅ Consistent English documentation: Translated existing Russian comments to English
• ✅ Proper exception documentation: Added <exception> tags where applicable
• ✅ Parameter and return value descriptions: Every method parameter and return value is documented
• ✅ Removed suppression directive: Replaced #pragma warning disable CS1591 as documentation is now complete

What was documented

The ILinksExtensions class provides essential extension methods for the ILinks<TLinkAddress> interface, including:

• Random operations (creation, search, deletion)
• Link manipulation (create, update, delete, merge)
• Validation methods (ensure existence, check constraints)
• Query operations (search, filter, format)
• Path traversal and structure formatting
• Garbage collection utilities
• Usage tracking and management

Code Quality

• ✅ Builds successfully: Project compiles without errors
• ✅ Follows existing patterns: Documentation style matches codebase conventions
• ✅ Meaningful descriptions: Each method's purpose and behavior is clearly explained

Closes

Fixes #166 (specifically completes the ILinksExtensions.cs file with 250 RUB reward)

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