fix(errorHandler): use error.stack instead of error.toString') to get more...

fix(errorHandler): use error.stack instead of error.toString') to get more details during development

backend/services/jsonErrorHandler.js

@@ -4,7 +4,7 @@
 const jsonErrorHandler = function (error, req, res, next) {
   if (!res.headersSent) {
     if (process.env.NODE_ENV === "development") {
-      res.status(500).json({ message: error.toString() });
+      res.status(500).json({ message: error.stack });
     } else {
       // Hide error details in production to avoid security issues
       res.status(500).json({ message: "Internal server error" });