fix: 组织架构页面无数据 - 响应拦截器已剥离一层data，无需再取r.data.data

api.ts 响应拦截器 (response) => response.data 已剥离 axios response，
OrgChart 中 api.get().then(r => r.data.data) 多取了一层导致返回 undefined。
改为 .then(r => r.data) 即可正确获取部门/岗位数组。

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frontend/src/pages/OrgChart.tsx

@@ -22,12 +22,12 @@ export default function OrgChart() {
 
   const { data: departments = [], isLoading } = useQuery({
     queryKey: ['departments'],
-    queryFn: () => api.get('/departments').then(r => r.data.data),
+    queryFn: () => api.get('/departments').then(r => r.data),
   })
 
   const { data: positions = [] } = useQuery({
     queryKey: ['positions'],
-    queryFn: () => api.get('/positions').then(r => r.data.data),
+    queryFn: () => api.get('/positions').then(r => r.data),
     enabled: tab === 'position',
   })