feat: 新增技能编排引擎和工作流构建器组件

refactor: 统一Hands系统常量到单个源文件
refactor: 更新Hands中文名称和描述

fix: 修复技能市场在连接状态变化时重新加载
fix: 修复身份变更提案的错误处理逻辑

docs: 更新多个功能文档的验证状态和实现位置
docs: 更新Hands系统文档

test: 添加测试文件验证工作区路径

desktop/src/lib/workflow-builder/index.ts

@@ -0,0 +1,11 @@
+/**
+ * Workflow Builder Library
+ *
+ * Provides types, converters, and utilities for building visual workflow editors.
+ */
+
+export * from './types';
+export * from './yaml-converter';
+
+// Re-export commonly used types from @xyflow/react
+export type { Node, Edge, Connection } from '@xyflow/react';