feat: 添加二级导航，解决二级导航的展示问题

src/mocks/handlers/index.js

@@ -3,6 +3,7 @@
 
 import { authHandlers } from './auth';
 import { accountHandlers } from './account';
+import { simulationHandlers } from './simulation';
 
 // 可以在这里添加更多的 handlers
 // import { userHandlers } from './user';
@@ -11,6 +12,7 @@ import { accountHandlers } from './account';
 export const handlers = [
     ...authHandlers,
     ...accountHandlers,
+    ...simulationHandlers,
     // ...userHandlers,
     // ...eventHandlers,
 ];