refactor: leaderboard controller

server/src/api/controllers/leaderboardController.ts

@@ -1,7 +1,8 @@
+import type { Request, Response } from 'express'
 import { asyncHandler } from '../../middleware/error.js'
 import { leaderboard } from '../../models/userManager.js'
 
-export default asyncHandler(async (req, res) => {
+export default asyncHandler(async (req: Request, res: Response) => {
   const users = await leaderboard()
   const response = users.map((user) => ({
     username: user.user.username,