refactor(frontend): import宣言周りのエラーを修正 (#12773)

packages/frontend/src/widgets/server-metric/index.vue

@@ -21,7 +21,7 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { onUnmounted, ref } from 'vue';
-import { useWidgetPropsManager, Widget, WidgetComponentExpose } from '../widget';
+import { useWidgetPropsManager, Widget, WidgetComponentExpose } from '../widget.js';
 import XCpuMemory from './cpu-mem.vue';
 import XNet from './net.vue';
 import XCpu from './cpu.vue';