refactor: restructure aster/ to match standard exchange directory layout

- Move aster-adapter.ts → aster/adapter.ts (consistent with all other exchanges)
- Rename aster/client.ts → aster/gateway.ts (consistent naming)
- Update all imports across 5 files
- Delete old aster-adapter.ts

src/exchanges/aster/adapter.ts

@@ -6,10 +6,10 @@ import type {
   KlineListener,
   OrderListener,
   TickerListener,
-} from "./adapter";
-import type { Order, CreateOrderParams, Depth, Ticker, Kline } from "./types";
-import { extractMessage } from "../utils/errors";
-import { AsterGateway } from "./aster/client";
+} from "../adapter";
+import type { Order, CreateOrderParams, Depth, Ticker, Kline } from "../types";
+import { extractMessage } from "../../utils/errors";
+import { AsterGateway } from "./gateway";
 
 export interface AsterCredentials {
   apiKey?: string;

src/exchanges/create-adapter.ts

@@ -1,5 +1,5 @@
 import type { ExchangeAdapter } from "./adapter";
-import { AsterExchangeAdapter, type AsterCredentials } from "./aster-adapter";
+import { AsterExchangeAdapter, type AsterCredentials } from "./aster/adapter";
 import { GrvtExchangeAdapter, type GrvtCredentials } from "./grvt/adapter";
 import { LighterExchangeAdapter, type LighterCredentials } from "./lighter/adapter";
 import { BackpackExchangeAdapter, type BackpackCredentials } from "./backpack/adapter";

src/exchanges/resolve-from-env.ts

@@ -1,6 +1,6 @@
 import type { ExchangeAdapter } from "./adapter";
 import { createExchangeAdapter, resolveExchangeId, type SupportedExchangeId } from "./create-adapter";
-import type { AsterCredentials } from "./aster-adapter";
+import type { AsterCredentials } from "./aster/adapter";
 import type { LighterCredentials } from "./lighter/adapter";
 import type { BackpackCredentials } from "./backpack/adapter";
 import type { ParadexCredentials } from "./paradex/adapter";

src/strategy/basis-arb-engine.ts

@@ -1,7 +1,7 @@
 import type { BasisArbConfig } from "../config";
 import type { ExchangeAdapter, FundingRateSnapshot } from "../exchanges/adapter";
 import type { AccountSnapshot, Depth, AsterSpotBookTicker } from "../exchanges/types";
-import { AsterSpotRestClient, AsterRestClient } from "../exchanges/aster/client";
+import { AsterSpotRestClient, AsterRestClient } from "../exchanges/aster/gateway";
 import { createTradeLog, type TradeLogEntry } from "../logging/trade-log";
 import { StrategyEventEmitter } from "./common/event-emitter";
 import { safeSubscribe, type LogHandler } from "./common/subscriptions";

tests/aster-spot-rest.test.ts

@@ -1,6 +1,6 @@
 import crypto from "crypto";
 import { afterAll, afterEach, beforeAll, beforeEach, describe, expect, it, vi } from "vitest";
-import { AsterSpotRestClient } from "../src/exchanges/aster/client";
+import { AsterSpotRestClient } from "../src/exchanges/aster/gateway";
 
 describe("AsterSpotRestClient", () => {
   const originalFetch = globalThis.fetch;

tests/exchange-factory.test.ts

@@ -1,6 +1,6 @@
 import { describe, expect, it, beforeEach, afterEach } from "vitest";
 import { createExchangeAdapter, resolveExchangeId } from "../src/exchanges/create-adapter";
-import { AsterExchangeAdapter } from "../src/exchanges/aster-adapter";
+import { AsterExchangeAdapter } from "../src/exchanges/aster/adapter";
 import { GrvtExchangeAdapter } from "../src/exchanges/grvt/adapter";
 import { BackpackExchangeAdapter } from "../src/exchanges/backpack/adapter";
 import { ParadexExchangeAdapter } from "../src/exchanges/paradex/adapter";