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/MkEmojiPicker.vue

@@ -1,3 +1,8 @@
+<!--
+SPDX-FileCopyrightText: syuilo and other misskey contributors
+SPDX-License-Identifier: AGPL-3.0-only
+-->
+
 <template>
 <div class="omfetrab" :class="['s' + size, 'w' + width, 'h' + height, { asDrawer, asWindow }]" :style="{ maxHeight: maxHeight ? maxHeight + 'px' : undefined }">
 	<input ref="searchEl" :value="q" class="search" data-prevent-emoji-insert :class="{ filled: q != null && q != '' }" :placeholder="i18n.ts.search" type="search" @input="input()" @paste.stop="paste" @keydown.stop.prevent.enter="onEnter">