fix: address code quality issues in I/Q/T/C regions

wanshenmean

2026-03-13 770e9488fad76cdf987e6992f84ff4064b5afcfb

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<Project Sdk="Microsoft.NET.Sdk">
 
  <PropertyGroup>
    <TargetFramework>net6.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>
 
</Project>