feat: 接入 USDT-M 合约数据 — type 字段方案

- PairType 定义移至 types/kline.ts (spot/um/cm)
- Kline 接口新增 type 字段，全链路透传
- klines 5列复合主键 (exchange, symbol, type, interval, time)
- 拆出 BinanceFuturesRestClient (USDMClient)
- exchanges/index.ts 注册 binance_futures
- trading_pairs 唯一约束加 type，种子数据加合约对
- 12个连续聚合视图 SELECT/GROUP BY/INDEX 加 type
- 清理 bnkline.ts 废弃代码和 pair.ts 空函数

data/run/exchange.ts

@@ -11,7 +11,8 @@ function getNowMinuteMS() {
 const allPairs = await getAllPairs();
 
 for (const pair of allPairs) {
-    const client = createRestClient("binance");
+    const exchangeId = pair.type === 'um' ? 'binance_futures' : 'binance';
+    const client = createRestClient(exchangeId);
     let lastBackfillTime = pair.last_backfill_time.getTime();
     try {
         while (lastBackfillTime < getNowMinuteMS()) {
@@ -26,7 +27,7 @@ for (const pair of allPairs) {
                 await upsertOrUpdateKlines(klines);
                 const lastK = klines[klines.length - 1];
                 if (lastK) {
-                    await updatePairLastBackfillTime(lastK?.symbol, new Date(lastK.openTime));
+                    await updatePairLastBackfillTime(lastK?.symbol, new Date(lastK.openTime), pair.type);
                     if (lastBackfillTime === lastK.openTime) {
                         break;
                     }