fix: DataSyncPage 修复 loadData TDZ 错误 — 将轮询 useEffect 移至 useCallback 定义之后

将引用 loadData 的轮询 useEffect 从 useCallback 定义之前移至之后，
消除 JavaScript 暂时死区（TDZ）导致的 ReferenceError。
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

frontend/src/pages/DataSyncPage.tsx

@@ -873,14 +873,6 @@ export function DataSyncPage() {
   const [batches, setBatches] = useState<SyncBatch[]>([])
   const [deletingBatch, setDeletingBatch] = useState<string | null>(null)
 
-  // 轮询：当有任务正在运行时，每3秒刷新一次任务列表
-  useEffect(() => {
-    const hasRunning = sources.some(s => s.is_running)
-    if (!hasRunning) return
-    const timer = setInterval(() => { loadData() }, 3000)
-    return () => clearInterval(timer)
-  }, [sources, loadData])
-
   // 加载数据
   const loadData = useCallback(async () => {
     try {
@@ -901,6 +893,14 @@ export function DataSyncPage() {
 
   useEffect(() => { loadData() }, [loadData])
 
+  // 轮询：当有任务正在运行时，每3秒刷新一次任务列表
+  useEffect(() => {
+    const hasRunning = sources.some(s => s.is_running)
+    if (!hasRunning) return
+    const timer = setInterval(() => { loadData() }, 3000)
+    return () => clearInterval(timer)
+  }, [sources, loadData])
+
   // 执行同步
   const handleRunSync = async (source: SyncSource) => {
     setSyncing(s => ({ ...s, [source.id]: true }))

frontend/vite.config.ts

@@ -8,6 +8,7 @@ export default defineConfig({
     alias: { '@': path.resolve(__dirname, './src') },
   },
   server: {
+    host: '0.0.0.0',
     port: 5173,
     proxy: {
       '/api': { target: 'http://localhost:8000', changeOrigin: true },