fix(lighter) incorrect order parsing for createOrder

[PimRijkers]

Problem

The current parseOrder method doesn't parse correctly for the createOrder method.

Explanation

The current parseOrder method focuses on parsing orders that are received from the fetch and watch methods.
The parseOrder method is also used for deep-extending the order object that is returned by the createOrder method. The deep-extend uses the method parameters to extend from, but these values can't be used directly. They are corresponding integer values of the actual string values.

Solution

Check for integer values and create corresponding string values from them. These string values will then be used to correctly parse the order.

Other Minor Changes

Added post-only property
Corrected parameter/variable naming
Corrected time-in-force ordering

[carlosmiei]

@PimRijkers thanks for your contribution, we will review and merge it soon.

[Copilot]

Pull request overview

This PR fixes lighter#parseOrder so it correctly parses orders returned from createOrder, where the deep-extended request fields (e.g., order_type, time_in_force, is_ask, reduce_only) are integers rather than the string values expected by the existing parser.

Changes:

• Added integer-to-string normalization for is_ask, order_type, time_in_force, and reduce_only inside parseOrder.
• Fixed/standardized time-in-force parsing by introducing parseOrderTimeInForce and parseOrderTimeInForceInteger (and removed the misspelled former helper).
• Updated static test expectations for createOrder parsed responses (type, timeInForce, side, reduceOnly, postOnly).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
ts/src/lighter.ts	Updates parseOrder to handle integer-encoded fields from createOrder deep-extend, adds integer parsing helpers, and sets postOnly/reduceOnly consistently.
ts/src/test/static/response/lighter.json	Adjusts expected parsed createOrder outputs to reflect correct parsing (e.g., type, timeInForce, side, reduceOnly).

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