add: 添加实验列表界面，实验增删完全依赖数据库实现

src/components/LabCanvas/DiagramCanvas.vue

@@ -119,6 +119,7 @@
             componentManager.prepareComponentProps(
               component.attrs || {},
               component.id,
+              props.examId,
             )
           "
           @update:bindKey="
@@ -175,9 +176,7 @@ import {
   ref,
   reactive,
   onMounted,
-  onUnmounted,
   computed,
-  watch,
   provide,
 } from "vue";
 import { useEventListener } from "@vueuse/core";
@@ -217,6 +216,7 @@ const emit = defineEmits(["toggle-doc-panel", "open-components"]);
 // 定义组件接受的属性
 const props = defineProps<{
   showDocPanel?: boolean; // 添加属性接收文档面板的显示状态
+  examId?: string; // 新增examId属性
 }>();
 
 // 获取componentManager实例
@@ -977,7 +977,8 @@ function exportDiagram() {
 onMounted(async () => {
   // 加载图表数据
   try {
-    diagramData.value = await loadDiagramData();
+    // 传入examId参数，让diagramManager处理动态加载
+    diagramData.value = await loadDiagramData(props.examId);
 
     // 预加载所有组件模块
     const componentTypes = new Set<string>();