chore(api): expose real 500 error stack trace for scrap scan API

inventory-backend/app/api/v1/scrap.py

@@ -50,8 +50,9 @@ def scan_barcode():
         else:
             return jsonify({'code': 404, 'msg': '未找到对应的库存记录'}), 404
     except Exception as e:
-        traceback.print_exc()
-        return jsonify({'code': 500, 'msg': f'扫描查询出错: {str(e)}'}), 500
+        import traceback
+        traceback.print_exc()  # 强制在控制台打印真实错误堆栈
+        return jsonify({"code": 500, "msg": f"服务器内部错误详情: {str(e)}"}), 500
 
 
 # --------------------------------------------------------