refactor(frontend): Reactivityで型を明示するように (#12791)

* refactor(frontend): Reactivityで型を明示するように

* fix: プロパティの参照が誤っているのを修正

* fix: 初期化の値を空配列に書き換えていた部分をnullに置き換え

packages/frontend/src/pages/admin/overview.moderators.vue

@@ -18,10 +18,11 @@ SPDX-License-Identifier: AGPL-3.0-only
 
 <script lang="ts" setup>
 import { onMounted, ref } from 'vue';
+import * as Misskey from 'misskey-js';
 import * as os from '@/os.js';
 import { defaultStore } from '@/store.js';
 
-const moderators = ref<any>(null);
+const moderators = ref<Misskey.entities.UserDetailed[] | null>(null);
 const fetching = ref(true);
 
 onMounted(async () => {