feat(frontend): 自选分时请求带 prefer_local, 策略页行为不变

- klineMinuteBatch 加 preferLocal 参数, 响应类型补 full_minute_local
- 仅 Watchlist 分时轮询传 true (全量分钟健康时股票不走批量补拉);
  Screener 不传, 严格限定本轮只辐射自选场景

frontend/src/lib/api.ts

@@ -2052,10 +2052,10 @@ export const api = {
       method: 'POST',
       body: JSON.stringify({ symbols, days }),
     }),
-  klineMinuteBatch: (symbols: string[], date?: string) =>
+  klineMinuteBatch: (symbols: string[], date?: string, preferLocal?: boolean) =>
-    request<{ data: Record<string, MinuteKlineRow[]> }>('/api/kline/minute-batch', {
+    request<{ data: Record<string, MinuteKlineRow[]>; full_minute_local?: boolean }>('/api/kline/minute-batch', {
       method: 'POST',
-      body: JSON.stringify({ symbols, date }),
+      body: JSON.stringify({ symbols, date, ...(preferLocal ? { prefer_local: true } : {}) }),
     }),
   instrumentSearch: (q: string, limit = 20, assetTypes?: string) =>
     request<{ results: { symbol: string; name: string; code: string; asset_type?: string }[] }>(

frontend/src/pages/Watchlist.tsx

@@ -880,7 +880,9 @@ export function Watchlist() {
   const intradayRefreshInterval = prefsData?.minute_intraday_refresh_interval ?? 6
   const minuteBatch = useQuery({
     queryKey: QK.minuteBatch(minuteSymbolsKey),
-    queryFn: () => api.klineMinuteBatch(minuteSymbols),
+    // prefer_local: 全量分钟服务健康时股票缺口不再批量补拉 (本地分区由服务持续写入),
+    // 大自选(数百上千只)不再持续打批量分钟接口
+    queryFn: () => api.klineMinuteBatch(minuteSymbols, undefined, true),
     enabled: intradayVisible && minuteSymbols.length > 0 && !groupCardsOpen,
     staleTime: 10_000,
     refetchInterval: (intradayRefreshEnabled && realtimeRunning) ? intradayRefreshInterval * 1000 : false,