feat: Convert to modules

server.js

@@ -1,8 +1,8 @@
-const express = require("express");
-const path = require("path");
+import express from "express";
+import path from "path";
 const app = express();
-const fs = require("fs/promises");
-const { getCurrentInterval } = require("./scheduleRules");
+import fs from "fs/promises";
+import { getCurrentInterval } from "./scheduleRules.js";
 
 const PORT = process.env.PORT || 3000;