chiDT e09c63080e Port to .NET Framework 4.8 with C# 9.0 compatibility
- Change target framework from net6.0 to net48 with LangVersion 9.0
- Remove nullable reference types for .NET Framework compatibility
- Replace Convert.FromHexString/ToHexString with custom implementations
- Fix switch pattern matching to use traditional case statements
- Replace range operators with LINQ Take/Skip and Array.Copy
- Replace Math.Log2 with Math.Log(p)/Math.Log(2) formula
- Fix Contains method calls to use ToLower() instead of StringComparison

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Co-Authored-By: Claude <noreply@anthropic.com>
2025-09-07 20:02:22 +09:00
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