Wait for order resolution after submit and modify

[willzhqiang]

Summary

• Wait for stock order submit/modify/cancel operations to reach a terminal order status or the caller-provided timeout.
• Reuse the same wait helper across submit, modify, and cancel paths.
• Add unit coverage for waiting until a done status and returning immediately when already done.

Motivation

The CLI currently places or modifies an order and then waits for at most 0.75 seconds before disconnecting. On slower order-status paths, especially exchange-routed or non-US orders, the command can return before the order has reached a stable terminal state. This makes the result less reliable for users and agents that need to know whether an order was filled, cancelled, or left active.

This change makes the existing --timeout option apply to order lifecycle resolution instead of only connection setup and the initial API call.

Validation

• uv run --extra test pytest