配置为Self-contained发布

添加自包含发布配置，生成独立可执行文件：
- SelfContained=true：包含.NET Framework运行时
- PublishSingleFile=true：生成单个exe文件
- PublishReadyToRun=true：预编译优化
- IncludeNativeLibrariesForSelfExtract=true：包含自解压库
- RuntimeIdentifier=win-x64：针对64位Windows

这样生成的exe文件约60-100MB，可在任何Windows系统上运行，无需预装.NET Framework

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

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

SlideCombine.csproj

@@ -8,6 +8,13 @@
     <RootNamespace>SlideCombine</RootNamespace>
     <ApplicationIcon>app.ico</ApplicationIcon>
     <Win32Resource />
+
+    <!-- 自包含发布配置 -->
+    <SelfContained>true</SelfContained>
+    <PublishSingleFile>true</PublishSingleFile>
+    <PublishReadyToRun>true</PublishReadyToRun>
+    <IncludeNativeLibrariesForSelfExtract>true</IncludeNativeLibrariesForSelfExtract>
+    <RuntimeIdentifier>win-x64</RuntimeIdentifier>
   </PropertyGroup>
 
   <ItemGroup>