admin/accounts/createで一般ユーザーがアカウントを作成し放題なのを修正 (#6205)

src/server/api/endpoints/admin/accounts/create.ts

@@ -18,7 +18,7 @@ export const meta = {
 
 export default define(meta, async (ps, me) => {
 	const noUsers = (await Users.count({})) === 0;
-	if (!noUsers && me == null) throw new Error('access denied');
+	if (!noUsers && !me?.isAdmin) throw new Error('access denied');
 
 	const { account, secret } = await signup(ps.username, ps.password);