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/useGetEdgesBySource.svelte.ts

@@ -1,6 +1,7 @@
-import { store } from '#store/stores.svelte';
+import { useTinyflowStore } from '#store/stores.svelte';
 
 export const useGetEdgesBySource = () => {
+  const store = useTinyflowStore();
   const getEdgesBySource = (target: string) => {
     const edges = store.getEdges();
     return edges.filter((edge) => edge.source === target);