Fix crypto import - use proper require statement

routes/subtitleSubmissions.js

@@ -1,6 +1,7 @@
 const express = require('express');
 const router = express.Router();
 const mongoose = require('mongoose');
+const crypto = require('crypto');
 const SubtitleSubmission = require('../models/SubtitleSubmission');
 const auth = require('../middleware/auth');
 
@@ -76,7 +77,7 @@ router.post('/submit', auth, async (req, res) => {
       validUserId = mongoose.Types.ObjectId(userId);
     } catch (error) {
       // If userId is not a valid ObjectId, create a consistent one based on username
-      const usernameHash = require('crypto').createHash('md5').update(displayUsername).digest('hex');
+      const usernameHash = crypto.createHash('md5').update(displayUsername).digest('hex');
       validUserId = new mongoose.Types.ObjectId(usernameHash.substring(0, 24));
     }