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/test.ts

@@ -0,0 +1,27 @@
+import { MainClient, type Kline as BinanceRestKline, CoinMClient, USDMClient } from "binance";
+
+const usdMClient = new USDMClient();
+const coinMClient = new CoinMClient();
+
+console.log(await usdMClient.getKlines({
+    symbol: 'BTCUSDT',
+    interval: "1m",
+    startTime: 0,
+    limit: 2,
+}));
+
+// console.log(await coinMClient.getKlines({
+//     symbol: 'BTCUSD_PERP',
+//     interval: "1d",
+//     startTime: 0,
+//     limit: 2,
+// }));
+
+// const data = await coinMClient.getExchangeInfo();
+
+// for (const item of data.symbols) {
+//     if (item.pair !== 'BTCUSD') {
+//         continue;
+//     }
+//     console.log(item);
+// }