refactor: add specific type hints for all side: str

[RecRanger]

Overview

Description

Add specific type hints for all side: str. Generally, they are side: Literal["BUY", "SELL"]

Types of changes

• Refactor/enhancement
• Bug fix/behavior correction
• New feature
• Breaking change
• Other, additional

Notes

Status

• Prefix PR title with [WIP] if necessary (changes not yet made).
• Add tests to cover changes as needed.
• Update documentation/changelog as needed.
• Verify all tests run correctly in CI and pass.
• Ready for review/merge.

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Note

Low Risk
Low risk refactor limited to type annotations; runtime behavior is unchanged, though stricter typing may surface downstream mypy/IDE warnings where non-supported side strings are passed.

Overview
Tightens type hints across the client, order builder, and RFQ types by replacing generic side: str parameters with Literal["BUY", "SELL"] (and "" where optional) to make valid order sides explicit.

Updates affected function signatures and dataclass fields (e.g., OrderArgs, MarketOrderArgs, BookParams, RFQ user inputs, and calculate_market_price) and adds the necessary Literal imports.

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