enhance: AVIF support (#9281)

* chore: Make image/avif browsersafe

* server side

* change FileInfoService

* ✌️

* avifはMastodonでは絶望的 see https://github.com/misskey-dev/misskey/issues/9283

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

packages/backend/src/const.ts

@@ -12,6 +12,7 @@ export const FILE_TYPE_BROWSERSAFE = [
 	'image/gif',
 	'image/jpeg',
 	'image/webp',
+	'image/avif',
 	'image/apng',
 	'image/bmp',
 	'image/tiff',