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 (#141)

* 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

* 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>

* chore: Add SPDX-License-Identifier [skip ci]

* add missing SPDX-License-Identifier

* remove unused file

---------

Co-authored-by: Shun Sakai <sorairolake@protonmail.ch>
Co-authored-by: syuilo <Syuilotan@yahoo.co.jp>
Co-authored-by: Chocolate Pie <106949016+chocolate-pie@users.noreply.github.com>

packages/backend/src/core/entities/InstanceEntityService.ts

@@ -1,3 +1,8 @@
+/*
+ * SPDX-FileCopyrightText: syuilo and other misskey contributors
+ * SPDX-License-Identifier: AGPL-3.0-only
+ */
+
 import { Inject, Injectable } from '@nestjs/common';
 import { DI } from '@/di-symbols.js';
 import type { InstancesRepository } from '@/models/index.js';