修复.NET Framework发布配置问题

移除不兼容的PublishSingleFile配置：
- .NET Framework 4.8不支持PublishSingleFile
- 移除IncludeNativeLibrariesForSelfExtract（Core功能）
- 保留SelfContained和PublishReadyToRun

现在使用命令：dotnet publish -c Release -r win-x64 --self-contained

生成的会是包含多个文件的发布文件夹，用户可以直接运行主exe

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

SlideCombine.csproj

@@ -11,9 +11,7 @@
 
     <!-- 自包含发布配置 -->
     <SelfContained>true</SelfContained>
-    <PublishSingleFile>true</PublishSingleFile>
     <PublishReadyToRun>true</PublishReadyToRun>
-    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
   </PropertyGroup>
 
   <ItemGroup>