enhance(backend): Misskey.ioのロゴを適用

packages/backend/assets/LICENSE_MisskeyHQ

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+LICENSE
+-------
+
+The following files:
+
+- splash.png
+- favicon.png
+- favicon.ico
+- apple-touch-icon.png
+- icons/192.png
+- icons/512.png
+
+are owned by MisskeyHQ and are subject to copyright, with all rights reserved by MisskeyHQ. These files may not be redistributed, modified, or reused in any way without explicit permission from MisskeyHQ.
+
+Copyright (c) 2023 MisskeyHQ
+
+All rights reserved.
+
+This digital asset and related documentation are the property of MisskeyHQ.
+
+Permission is hereby granted to the user of this digital asset and related documentation to use, copy, and publish the asset for any purpose, provided that this notice and disclaimer of warranty appears in all copies. The user is expressly prohibited from distributing, sublicensing, selling, reselling, or transferring the asset for profit. Any form of modification or tampering with the asset is strictly prohibited.
+
+IN NO EVENT SHALL MISSKEYHQ BE LIABLE FOR ANY DAMAGES WHATSOEVER, INCLUDING BUT NOT LIMITED TO DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES, ARISING OUT OF THE USE, COPYING, PUBLISHING, OR MODIFICATION OF THIS ASSET.
+
+NO WARRANTIES OF ANY KIND ARE OFFERED FOR THIS ASSET. THIS ASSET IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED. USE AT YOUR OWN RISK.