Fix: include OpenCvSharp.Analyzers.dll in NuGet package under analyzers/dotnet/cs/

OutputItemType="Analyzer" on a ProjectReference enables the analyzer during
in-solution builds but does not cause the DLL to be packaged into the NuGet
package. Add an explicit None item with Pack=true and PackagePath=analyzers/dotnet/cs
so that the Roslyn analyzers (OCVS001–OCVS005) are active for consumers of the
OpenCvSharp4 NuGet package.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: shimat

src/OpenCvSharp/OpenCvSharp.csproj

@@ -46,11 +46,17 @@
   </ItemGroup>
 
   <ItemGroup>
-    <!-- Include the analyzer in this package under analyzers/dotnet/cs/ -->
+    <!-- OutputItemType="Analyzer" enables the analyzer during in-solution builds.
+         The None item below is also required to place the DLL under analyzers/dotnet/cs/
+         inside the NuGet package; OutputItemType alone does not trigger packaging. -->
     <ProjectReference Include="..\OpenCvSharp.Analyzers\OpenCvSharp.Analyzers.csproj"
                       ReferenceOutputAssembly="false"
                       OutputItemType="Analyzer"
                       SetTargetFramework="TargetFramework=netstandard2.0" />
+    <None Include="..\OpenCvSharp.Analyzers\bin\$(Configuration)\netstandard2.0\OpenCvSharp.Analyzers.dll"
+          Pack="true"
+          PackagePath="analyzers/dotnet/cs"
+          Visible="false" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.1'">
     <PackageReference Include="System.Runtime.CompilerServices.Unsafe" Version="6.1.2" />