chore: 著作権とライセンスについての情報を各ファイルに追加する (#11348)

* chore: Add the SPDX information to each file

Add copyright and licensing information as defined in version 3.0 of
the REUSE Specification.

* tweak format

---------

Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>

packages/frontend/src/components/MkWaitingDialog.vue

@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: syuilo and other misskey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
 <template>
 <MkModal ref="modal" :preferType="'dialog'" :zPriority="'high'" @click="success ? done() : () => {}" @closed="emit('closed')">
 	<div :class="[$style.root, { [$style.iconOnly]: (text == null) || success }]">