feat: implement role-based access control and auth routes

This commit implements the role-based access control middleware and adds auth routes with proper role checks for user, moderator, and admin roles as defined in the documentation.

backend/routes/disputes.js

@@ -0,0 +1,26 @@
+// routes/disputes.js
+const express = require('express');
+const router = express.Router();
+const requireRole = require('../middleware/requireRole');
+
+// Protected route - create dispute
+router.post('/', requireRole(['user', 'moderator', 'admin']), (req, res) => {
+  // Implementation for creating a dispute
+});
+
+// Protected route - get disputes
+router.get('/', requireRole(['user', 'moderator', 'admin']), (req, res) => {
+  // Implementation for getting disputes
+});
+
+// Protected route - update dispute status
+router.put('/:id/status', requireRole(['moderator', 'admin']), (req, res) => {
+  // Implementation for updating dispute status
+});
+
+// Protected route - resolve dispute
+router.put('/:id/resolve', requireRole(['moderator', 'admin']), (req, res) => {
+  // Implementation for resolving a dispute
+});
+
+module.exports = router;