fix: Information exposure through an exception (#123)

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

services/api/src/api/handlers.py

@@ -278,6 +278,6 @@ def handle_standard_response(
             "created_at": datetime.now(timezone.utc).isoformat(),
             "done": True,
             "done_reason": "error",
-            "error": str(e),
+            "error": "An internal error has occurred. Please try again later.",
         }
         return jsonify(error_response)