refactor(Core): 折叠 6 段 TFM 条件 ItemGroup 为 2 段

违反架构不变量:csproj 重复了 props 已表达的 TFM 维度。

原状:6 段几乎相同的 ItemGroup 表达 6 个 TFM。
- ns2.0 / ns2.1 各 1 段(几乎完全相同,差异在 System.Runtime.Loader 都引入)
- net6/7/8/10 各 1 段(完全相同,都是同 2 个包)

折叠后:2 段。
- ns2.x 段(OR 条件):引入 3 个包(含 System.Runtime.Loader)
- 其余 .NET 段(AND-NOT 条件):引入 2 个包

dotnet list package --include-transitive 验证所有 TFM 仍拿到正确版本:
- ns2.0 → 2.2.0 / 3.1.6 / 4.3.0
- ns2.1 → 3.1.2 / 3.1.6 / 4.3.0
- net6 → 6.0.0 / 6.0.0
- net7 → 7.0.0 / 7.0.0
- net8 → 8.0.0 / 8.0.0
- net10 → 10.0.0 / 10.0.0

未来新增 TFM (e.g. net11) 只需在 props 加 Update 段,csproj 无需改。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: hueifeng

src/Magicodes.ExporterAndImporter.Core/Magicodes.IE.Core.csproj

@@ -6,42 +6,20 @@
 	<ItemGroup>
 		<PackageReference Include="System.ComponentModel.Annotations" />
 	</ItemGroup>
-	<!-- netstandard2.0 依赖 -->
-	<ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">
-		<PackageReference Include="Microsoft.Extensions.DependencyInjection" />
-		<PackageReference Include="Microsoft.Extensions.DependencyModel" />
-		<PackageReference Include="System.Runtime.Loader" />
-	</ItemGroup>
 
-	<!-- netstandard2.1 依赖 -->
-	<ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.1' ">
+	<!-- netstandard 2.x 依赖 (System.Runtime.Loader 仅 ns2.0+ 需要) -->
+	<ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' OR '$(TargetFramework)' == 'netstandard2.1' ">
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection" />
 		<PackageReference Include="Microsoft.Extensions.DependencyModel" />
 		<PackageReference Include="System.Runtime.Loader" />
 	</ItemGroup>
 
-
-	<!-- .NET 6.0+ 依赖 -->
-	<ItemGroup Condition=" '$(TargetFramework)' == 'net6.0' ">
-		<PackageReference Include="Microsoft.Extensions.DependencyInjection" />
-		<PackageReference Include="Microsoft.Extensions.DependencyModel" />
-	</ItemGroup>
-
-	<ItemGroup Condition=" '$(TargetFramework)' == 'net7.0' ">
-		<PackageReference Include="Microsoft.Extensions.DependencyInjection" />
-		<PackageReference Include="Microsoft.Extensions.DependencyModel" />
-	</ItemGroup>
-
-	<ItemGroup Condition=" '$(TargetFramework)' == 'net8.0' ">
+	<!-- .NET 6+ 依赖 -->
+	<ItemGroup Condition=" '$(TargetFramework)' != 'netstandard2.0' AND '$(TargetFramework)' != 'netstandard2.1' ">
 		<PackageReference Include="Microsoft.Extensions.DependencyInjection" />
 		<PackageReference Include="Microsoft.Extensions.DependencyModel" />
 	</ItemGroup>
 
-	<ItemGroup Condition=" '$(TargetFramework)' == 'net10.0' ">
-		<PackageReference Include="Microsoft.Extensions.DependencyInjection" />
-		<PackageReference Include="Microsoft.Extensions.DependencyModel" />
-	</ItemGroup>
-	
 	<ItemGroup>
 		<Compile Update="Resource.Designer.cs">
 			<DesignTime>True</DesignTime>