perf(charts): import chart components from @gpustack/core-ui/charts

Switch all echarts-based chart imports to the dedicated core-ui charts
entry so echarts stays out of the synchronous entry bundle and loads
only on chart routes. Requires @gpustack/core-ui with the ./charts export.

src/pages/cluster-management/components/cluster-metrics.tsx

@@ -1,4 +1,5 @@
-import { GaugeChart, TemplateCard } from '@gpustack/core-ui';
+import { TemplateCard } from '@gpustack/core-ui';
+import { GaugeChart } from '@gpustack/core-ui/charts';
 import { useSearchParams } from '@umijs/max';
 import { Col, Row } from 'antd';
 import _ from 'lodash';

src/pages/cluster-management/components/trend-chart.tsx

@@ -1,4 +1,4 @@
-import { LineChart } from '@gpustack/core-ui';
+import { LineChart } from '@gpustack/core-ui/charts';
 import { useIntl } from '@umijs/max';
 import dayjs from 'dayjs';
 import _ from 'lodash';