Harden dev environment configuration

backend/src/routes/auth.js

@@ -4,6 +4,7 @@ const jwt = require('jsonwebtoken');
 const { body, validationResult } = require('express-validator');
 const pool = require('../database/connection');
 const { authenticateToken } = require('../middleware/auth');
+const config = require('../config');
 
 const router = express.Router();
 
@@ -47,7 +48,7 @@ router.post('/register', [
     // Generate JWT token
     const token = jwt.sign(
       { userId: user.id, email: user.email, role: user.role },
-      process.env.JWT_SECRET,
+      config.jwtSecret,
       { expiresIn: '24h' }
     );
 
@@ -106,7 +107,7 @@ router.post('/login', [
     // Generate JWT token
     const token = jwt.sign(
       { userId: user.id, email: user.email, role: user.role },
-      process.env.JWT_SECRET,
+      config.jwtSecret,
       { expiresIn: '24h' }
     );