fix: review fixes (#17208)

* fix: OAuthのContent-Typeを正しく判定するように

* fix(frontend): fix outdated comments

* fix: storagePersistenceのtop-level awaitを解消

* fix

* fix(frontend): add comment

Co-Authored-By: anatawa12 <anatawa12@icloud.com>

* fix

* fix: rename `users/get-following-users-by-birthday`

* fix: fix types

* Update MkForm.vue

* refactor utility/storage.ts

---------

Co-authored-by: anatawa12 <anatawa12@icloud.com>
Co-authored-by: syuilo <4439005+syuilo@users.noreply.github.com>

packages/backend/src/server/api/endpoints/admin/update-meta.ts

@@ -341,7 +341,7 @@ export default class extends Endpoint<typeof meta, typeof paramDef> { // eslint-
 
 			if (ps.clientOptions !== undefined) {
 				set.clientOptions = {
-					...serverSettings.clientOptions,
+					...this.serverSettings.clientOptions,
 					...ps.clientOptions,
 				};
 			}