feat: enhance role middleware with hasRole helper function

backend/middleware/role.middleware.js

@@ -20,4 +20,14 @@ export const requireRole = (requiredRoles) => {
       return res.status(403).json({ error: 'Forbidden' });
     }
   };
+};
+
+/**
+ * Helper function to check if a user has a specific role
+ * @param {string} userRole - The user's role
+ * @param {string[]} requiredRoles - Array of required roles
+ * @returns {boolean} Whether the user has at least one of the required roles
+ */
+export const hasRole = (userRole, requiredRoles) => {
+  return requiredRoles.includes(userRole);
 };