types(client): return typed order responses instead of any

[jasonandjay]

Addresses #307

What changed

• Replaced any return types in order-posting APIs with explicit types:
  • postOrder -> Promise<OrderResponse>
  • postOrders -> Promise<OrderResponse[]>
  • createAndPostOrder -> Promise<OrderResponse>
  • createAndPostMarketOrder -> Promise<OrderResponse>

Why

This improves TypeScript ergonomics and safety for SDK consumers by exposing concrete response shapes instead of any.

Validation

• pnpm lint
• pnpm build
• vitest run tests/utilities.test.ts

---

Note

Low Risk
Low risk; changes are TypeScript return-type annotations for order-posting methods and should not affect runtime behavior, but may require downstream callers to align with the OrderResponse shape.

Overview
Updates the client order submission APIs to return explicit response types instead of any. postOrder, postOrders, createAndPostOrder, and createAndPostMarketOrder now return OrderResponse/OrderResponse[], exposing a concrete response contract (e.g., success, errorMsg, orderID, transactionsHashes, status, amounts) for SDK consumers.

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