Framework reference instead of whole sdk change

Author: alex-kulakov

Extensions/Xtensive.Orm.Web/Xtensive.Orm.Web.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk.Web">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <IsPackable>true</IsPackable>
     <DocumentationFile>$(OutputPath)$(TargetFramework)\$(AssemblyName).xml</DocumentationFile>
@@ -21,6 +21,9 @@
       <PackagePath>.</PackagePath>
     </Content>
   </ItemGroup>
+  <ItemGroup>
+    <FrameworkReference Include="Microsoft.AspNetCore.App" />
+  </ItemGroup>
   <ItemGroup Condition="'$(TargetFramework)'=='net8.0'">
     <PackageReference Include="System.Configuration.ConfigurationManager" Version="8.0.1" />
   </ItemGroup>