build(Hi.Sample): keep the version line on 3.1

Follows the libraries back off the retracted 3.2 line: VersionPrefix returns to
3.1 and the floating HiAPI references to 3.1.*, which is what the feed serves.
This build counter was never reset, so it just keeps running.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

Hi.Sample.csproj

@@ -11,7 +11,7 @@
 		</Description>
 		<Configurations>Debug;Release</Configurations>
 		<VersionBuild>0</VersionBuild>
-		<VersionPrefix>3.2.$(VersionBuild)</VersionPrefix>
+		<VersionPrefix>3.1.$(VersionBuild)</VersionPrefix>
 		<Product>$(AssemblyName)</Product>
 		<ApplicationIcon>techcoordinate.ico</ApplicationIcon>
 		<Copyright>Copyright 2025 Tech Coordinate Co., Ltd.</Copyright>
@@ -32,7 +32,7 @@
 		<ProjectReference Include="..\HiNc\HiNc.csproj" />
 	</ItemGroup>
 	<ItemGroup Condition="'$(Configuration)'=='Release'">
-		<PackageReference Include="HiNc" Version="3.2.*" />
+		<PackageReference Include="HiNc" Version="3.1.*" />
 	</ItemGroup>
 	
 </Project>