カスタム絵文字にプロキシを復活 (#9481)

* wip

* Revert "Update ClientServerService.ts"

This reverts commit 88c64ece78.

* Revert "disable custom emoji proxy temporary"

This reverts commit 495d513efd.

* ✌️

packages/backend/src/misc/is-mime-image.ts

@@ -3,6 +3,7 @@ import { FILE_TYPE_BROWSERSAFE } from '@/const.js';
 const dictionary = {
 	'safe-file': FILE_TYPE_BROWSERSAFE,
 	'sharp-convertible-image': ['image/jpeg', 'image/png', 'image/gif', 'image/apng', 'image/vnd.mozilla.apng', 'image/webp', 'image/avif', 'image/svg+xml'],
+	'sharp-animation-convertible-image': ['image/jpeg', 'image/png', 'image/gif', 'image/webp', 'image/avif', 'image/svg+xml'],
 };
 
 export const isMimeImage = (mime: string, type: keyof typeof dictionary): boolean => dictionary[type].includes(mime);