feat: implement getPrecision method in AsterExchangeAdapter and enhance AsterGateway for precision handling in order normalization

src/exchanges/aster-adapter.ts

@@ -2,6 +2,7 @@ import type {
   AccountListener,
   DepthListener,
   ExchangeAdapter,
+  ExchangePrecision,
   KlineListener,
   OrderListener,
   TickerListener,
@@ -148,4 +149,20 @@ export class AsterExchangeAdapter implements ExchangeAdapter {
     await this.ensureInitialized("cancelAllOrders");
     await this.gateway.cancelAllOrders(params);
   }
+
+  async getPrecision(): Promise<ExchangePrecision | null> {
+    try {
+      const precision = await this.gateway.getPrecision(this.symbol);
+      if (!precision) return null;
+      return {
+        priceTick: precision.priceTick,
+        qtyStep: precision.qtyStep,
+        priceDecimals: precision.priceDecimals,
+        sizeDecimals: precision.sizeDecimals,
+      };
+    } catch (error) {
+      console.error("[AsterExchangeAdapter] getPrecision failed", error);
+      return null;
+    }
+  }
 }