perf: echarts 按需导入，分散注册到具体使用页面

- 移除 main.ts 中 echarts 全量导入和集中注册
- chart/index.vue 仅导入 init，改用 ReturnType 推断类型
- DataReportPage.vue 按需注册 LineChart/PieChart/RadarChart 及组件
- CanvasRenderer 保持全局注册，所有图表共用
- 主 chunk 减小 55%（1,279 kB → 572 kB），echarts 模块随页面懒加载

src/main.ts

@@ -2,13 +2,18 @@ import { createApp } from "vue";
 import "./style.less";
 import App from "./App.vue";
 import Chart from "./components/chart/index.vue";
-import * as echarts from "echarts";
+import { registerTheme } from "echarts/core";
+import { CanvasRenderer } from "echarts/renderers";
 import echartsConfig from "./config/echarts.config";
 import { createPinia } from "pinia";
 import router from "./router";
-import './router/routerGuard'
+import "./router/routerGuard";
 
-echarts.registerTheme("t-theme", echartsConfig);
+// CanvasRenderer 注册到全局，所有图表都需要
+import { use } from "echarts/core";
+use([CanvasRenderer]);
+
+registerTheme("t-theme", echartsConfig);
 
 const app = createApp(App);