refactor: rename Aster-prefixed universal types to clean names

- AsterOrder → Order
- AsterAccountSnapshot → AccountSnapshot
- AsterAccountPosition → AccountPosition
- AsterAccountAsset → AccountAsset
- AsterDepthLevel → DepthLevel
- AsterDepth → Depth
- AsterTicker → Ticker
- AsterKline → Kline

These types are the platform-agnostic contract used by all 8 exchanges,
not Aster-specific. Renamed across 63 files.

src/core/lib/orders.ts

@@ -1,11 +1,11 @@
 import type { ExchangeAdapter } from "../../exchanges/adapter";
-import type { AsterOrder } from "../../exchanges/types";
+import type { Order } from "../../exchanges/types";
 import { isUnknownOrderError } from "../../utils/errors";
 
 export async function safeCancelOrder(
   exchange: ExchangeAdapter,
   symbol: string,
-  order: AsterOrder,
+  order: Order,
   onResolved: (orderId: number | string) => void,
   onUnknown: () => void,
   onError: (err: unknown) => void