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/app/src/views/ai/agents/components/AgentToolForm.vue

@@ -18,6 +18,7 @@ import {
 const props = defineProps<{
   binding: AgentToolBinding;
   kind: 'mcp' | 'plugin' | 'workflow';
+  mcpToolsLoading?: boolean;
   options: AgentOption[];
 }>();
 
@@ -129,7 +130,11 @@ function handleTargetChange(value: string) {
         />
       </ElSelect>
     </ElFormItem>
-    <div v-if="kind === 'mcp'" class="agent-form__mcp-tools">
+    <div
+      v-if="kind === 'mcp'"
+      v-loading="mcpToolsLoading"
+      class="agent-form__mcp-tools"
+    >
       <div class="agent-form__mcp-tools-header">
         <span>工具列表</span>
         <span>{{ selectedMcpToolCount }} 个</span>