perf: 优化智能体与工作流幕布渲染性能

- 分阶段加载智能体配置并按需缓存 MCP 工具

- 合并画布状态更新与节点尺寸监听，启用大图可视区域渲染和静态连线

- 隔离 Tinyflow Store 实例并补充数据同步与回归测试

easyflow-ui-admin/packages/tinyflow-ui/src/components/utils/useCopyPasteHandler.svelte.ts

@@ -1,4 +1,4 @@
-import { store } from '#store/stores.svelte';
+import { useTinyflowStore } from '#store/stores.svelte';
 import { genShortId } from '#components/utils/IdGen';
 import { type Edge, type Node, useSvelteFlow } from '@xyflow/svelte';
 
@@ -119,6 +119,7 @@ function rewriteRefsInData(obj: any, idMap: Map<string, string>): any {
  * 复制粘贴处理器 Hook
  */
 export const useCopyPasteHandler = () => {
+  const store = useTinyflowStore();
   const svelteFlow = useSvelteFlow();
 
   const copyHandler = async (event: ClipboardEvent | KeyboardEvent) => {