feat: introduce S2A account management page with a dedicated API interaction hook.

frontend/src/hooks/useS2AApi.ts

@@ -42,11 +42,11 @@ export function useS2AApi() {
       try {
         const response: AccountListResponse = await s2aClient.getAccounts(params)
         return {
-          data: response.data,
-          total: response.total,
-          page: response.page,
-          page_size: response.page_size,
-          total_pages: Math.ceil(response.total / response.page_size),
+          data: response.data || [],
+          total: response.total || 0,
+          page: response.page || 1,
+          page_size: response.page_size || 20,
+          total_pages: Math.ceil((response.total || 0) / (response.page_size || 20)),
         }
       } catch (err) {
         const message = err instanceof Error ? err.message : '获取账号列表失败'

frontend/src/pages/Accounts.tsx

@@ -51,8 +51,8 @@ export default function Accounts() {
 
     const result = await getAccounts(params)
     if (result) {
-      setAccounts(result.data)
-      setTotal(result.total)
+      setAccounts(result.data || [])
+      setTotal(result.total || 0)
     }
     setRefreshing(false)
   }, [hasConfig, page, pageSize, search, statusFilter, getAccounts])