Refactor file handling in BuyProduct and Request models; implement file schema for better structure. Update routes to handle file uploads and downloads with improved error handling and logging. Adjust MongoDB connection management across scripts and routes for consistency.

server/routers/procurement/routes/experience.js

@@ -2,7 +2,8 @@ const express = require('express');
 const router = express.Router();
 const { verifyToken } = require('../middleware/auth');
 const Experience = require('../models/Experience');
-const { Types } = require('mongoose');
+const mongoose = require('../../../utils/mongoose');
+const { Types } = mongoose;
 
 // GET /experience - Получить список опыта работы компании
 router.get('/', verifyToken, async (req, res) => {