refactor: 移除WebSocket同步功能及相关代码

feat(theme): 增强侧边栏选中项样式配置
style: 优化主题变量和样式覆盖逻辑
chore: 清理未使用的依赖和配置文件

src/main/hosting/index.ts

@@ -0,0 +1,29 @@
+export { SecScoreHostBuilder, SecScoreHost, createHostBuilder, Host } from './hostBuilder'
+export { ServiceCollection, ServiceProvider } from './serviceCollection'
+export {
+  HostApplicationLifetimeToken,
+  AppConfigToken,
+  LoggerToken,
+  DbManagerToken,
+  SettingsStoreToken,
+  SecurityServiceToken,
+  PermissionServiceToken,
+  StudentRepositoryToken,
+  ReasonRepositoryToken,
+  EventRepositoryToken,
+  SettlementRepositoryToken,
+  ThemeServiceToken,
+  WindowManagerToken
+} from './tokens'
+export type {
+  appRuntimeContext,
+  hostedService,
+  middleware,
+  hostBuilderSettings,
+  hostBuilderContext,
+  configureServicesDelegate,
+  configureHostDelegate,
+  hostApplicationLifetime,
+  hostApplicationContext,
+  serviceToken
+} from './types'