refactor(config): 将 appsettings.json 转为嵌入资源

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

src/Gpulse.WCT.DataAnalyzer/Gpulse.WCT.DataAnalyzer.csproj

@@ -10,6 +10,10 @@
     <LangVersion>12.0</LangVersion>
   </PropertyGroup>
 
+  <ItemGroup>
+    <InternalsVisibleTo Include="Gpulse.WCT.DataAnalyzer.Tests" />
+  </ItemGroup>
+
   <ItemGroup>
     <!-- CLI -->
     <PackageReference Include="System.CommandLine" Version="2.0.0-beta4.22272.1" />
@@ -36,9 +40,7 @@
   </ItemGroup>
 
   <ItemGroup>
-    <None Update="appsettings.json">
-      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
-    </None>
+    <EmbeddedResource Include="appsettings.json" />
   </ItemGroup>
 
 </Project>