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/components/WorkflowBuilder/nodes/InputNode.tsx

@@ -0,0 +1,54 @@
+/**
+ * Input Node Component
+ *
+ * Node for defining workflow input variables.
+ */
+
+import React, { memo } from 'react';
+import { Handle, Position, NodeProps } from '@xyflow/react';
+import type { InputNodeData } from '../../../lib/workflow-builder/types';
+
+export const InputNode = memo(({ data, selected }: NodeProps<InputNodeData>) => {
+  return (
+    <div
+      className={`
+        px-4 py-3 rounded-lg border-2 min-w-[180px]
+        bg-emerald-50 border-emerald-300
+        ${selected ? 'border-emerald-500 shadow-lg shadow-emerald-200' : ''}
+      `}
+    >
+      {/* Output Handle */}
+      <Handle
+        type="source"
+        position={Position.Right}
+        className="w-3 h-3 bg-emerald-500 border-2 border-white"
+      />
+
+      {/* Header */}
+      <div className="flex items-center gap-2 mb-2">
+        <span className="text-lg">📥</span>
+        <span className="font-medium text-emerald-800">{data.label}</span>
+      </div>
+
+      {/* Variable Name */}
+      <div className="text-sm text-emerald-600">
+        <span className="font-mono bg-emerald-100 px-1.5 py-0.5 rounded">
+          {data.variableName}
+        </span>
+      </div>
+
+      {/* Default Value Indicator */}
+      {data.defaultValue !== undefined && (
+        <div className="text-xs text-emerald-500 mt-1">
+          default: {typeof data.defaultValue === 'string'
+            ? `"${data.defaultValue}"`
+            : JSON.stringify(data.defaultValue)}
+        </div>
+      )}
+    </div>
+  );
+});
+
+InputNode.displayName = 'InputNode';
+
+export default InputNode;