add project

apps/api/src/middleware/error-handler.ts

@@ -0,0 +1,6 @@
+import { Request, Response, NextFunction } from 'express';
+
+export function errorHandler(err: Error, _req: Request, res: Response, _next: NextFunction): void {
+  console.error('[ERROR]', err.message);
+  res.status(500).json({ success: false, error: 'Internal server error' });
+}