Use sync access for the temp JSON file database

Replace all async reads and writes to the JSON database with the sync
reads and writes to prevent a data corruption race condition where two
requests are processed at the same time and write to the same file, or
one reads while the other writes causing read of partially written data.

server/api/auth/ap/telegram-login.post.ts

@@ -84,11 +84,11 @@ export default defineEventHandler(async (event): Promise<ApiSession> => {
 	}
 
 	const slug = String(data.authData.id);
-	const authMethods = await readAuthenticationMethods();
+	const authMethods = readAuthenticationMethods();
 	const method = authMethods.find(method => method.provider === "telegram" && method.slug === slug);
 	let session;
 	if (method) {
-		const users = await readUsers();
+		const users = readUsers();
 		const account = users.find(user => !user.deleted && user.id === method.userId);
 		session = await setServerSession(event, account);
 	} else {