refactor(SSO): 重构通用SSO配置初始化逻辑

将通用SSO配置从JSON文件迁移至appsettings配置
移除旧的JSON配置文件并更新.gitignore
添加对IConfiguration的支持并保持向后兼容

.gitignore

@@ -1,4 +1,4 @@
-## Ignore Visual Studio temporary files, build results, and
+## Ignore Visual Studio temporary files, build results, and
 ## files generated by popular Visual Studio add-ons.
 
 # User-specific files
@@ -223,5 +223,6 @@ logfile
 /YLWebAPI/appsettings.Development.json
 /YLManageAPI/appsettings.Development.json
 /YLWebAPI/App_Docs
+/.idea
 /.idea/.idea.YLerpbase/.idea
 /NuGet.Config