优化前端认证与类型管理

frontend/src/api/systemConfigs.ts

@@ -1,4 +1,5 @@
 import { apiClient } from './client'
+import type { ApiResponse } from './types'
 
 export interface SystemConfig {
   id: number
@@ -10,12 +11,6 @@ export interface SystemConfig {
   updated_at: string
 }
 
-interface ApiResponse<T> {
-  code: string
-  message: string
-  data: T
-}
-
 export async function fetchSystemConfigs() {
   const { data } = await apiClient.get<ApiResponse<{ items: SystemConfig[] }>>('/admin/system-configs')
   return data.data.items