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

src/exchanges/types.ts

@@ -336,6 +336,35 @@ export interface AsterSpotExchangeFilter {
   [key: string]: string | number | boolean | undefined;
 }
 
+export interface AsterFuturesSymbolFilter {
+  filterType: string;
+  tickSize?: string;
+  stepSize?: string;
+  minPrice?: string;
+  maxPrice?: string;
+  minQty?: string;
+  maxQty?: string;
+  [key: string]: string | number | boolean | undefined;
+}
+
+export interface AsterFuturesSymbolInfo {
+  symbol: string;
+  pair?: string;
+  contractType?: string;
+  pricePrecision?: number;
+  quantityPrecision?: number;
+  baseAssetPrecision?: number;
+  quotePrecision?: number;
+  underlyingType?: string;
+  filters?: AsterFuturesSymbolFilter[];
+}
+
+export interface AsterFuturesExchangeInfo {
+  timezone?: string;
+  serverTime?: number;
+  symbols?: AsterFuturesSymbolInfo[];
+}
+
 export interface AsterSpotAssetInfo {
   asset: string;
 }