feat-visualization (#33)

尽管里面有点粪，但还是生成了漂亮的树，就当给树施肥了
剩下一个小问题：未考虑节点的宽度（因为名称不一样长），但目前未发现对图生成的明显影响

Co-authored-by: jackfiled <xcrenchangjun@outlook.com>
Reviewed-on: PostGuard/Canon#33
Co-authored-by: Ichirinko <1621543655@qq.com>
Co-committed-by: Ichirinko <1621543655@qq.com>

Canon.Server/Dockerfile

@@ -0,0 +1,6 @@
+FROM mcr.microsoft.com/dotnet/aspnet:8.0
+RUN apt update
+RUN apt install libfontconfig1 -y
+WORKDIR /App
+COPY bin/Release/net8.0/publish .
+ENTRYPOINT ["dotnet", "Canon.Server.dll"]