feat: 使用concurrently实现跨平台同时启动前后端

refactor(models): 优化模型初始化逻辑避免重复同步
refactor(OperationLog): 将createdAt索引改为operateTime
docs: 添加一次性启动解决方案文档

backend/models/OperationLog.js

@@ -81,8 +81,8 @@ const OperationLog = sequelize.define('OperationLog', {
     { fields: ['userId'] },
     { fields: ['action'] },
     { fields: ['module'] },
-    { fields: ['createdAt'] },
-    { fields: ['userId', 'createdAt'] }
+    { fields: ['operateTime'] },
+    { fields: ['userId', 'operateTime'] }
   ]
 });