feat(flows): 新增流程编辑器基础功能与相关组件

feat(backend): 添加流程模型与服务支持
feat(frontend): 实现流程编辑器UI与交互
feat(assets): 添加流程节点图标资源
feat(plugins): 实现上下文菜单和运行时插件
feat(components): 新增基础节点和侧边栏组件
feat(routes): 添加流程相关路由配置
feat(models): 创建流程和运行日志数据模型
feat(services): 实现流程服务层逻辑
feat(migration): 添加流程相关数据库迁移
feat(config): 更新前端配置支持流程编辑器
feat(utils): 增强axios错误处理和工具函数

frontend/src/flows/plugins/variable-panel-plugin/variable-panel-layer.tsx

@@ -0,0 +1,27 @@
+/**
+ * Copyright (c) 2025 Bytedance Ltd. and/or its affiliates
+ * SPDX-License-Identifier: MIT
+ */
+
+import { domUtils, injectable, Layer } from '@flowgram.ai/free-layout-editor';
+
+import { VariablePanel } from './components/variable-panel';
+
+@injectable()
+export class VariablePanelLayer extends Layer {
+  onReady(): void {
+    // Fix variable panel in the right of canvas
+    this.config.onDataChange(() => {
+      const { scrollX, scrollY } = this.config.config;
+      domUtils.setStyle(this.node, {
+        position: 'absolute',
+        right: 25 - scrollX,
+        top: scrollY + 25,
+      });
+    });
+  }
+
+  render(): JSX.Element {
+    return <VariablePanel />;
+  }
+}