fix: replace enumerate with (str, Enum)

[fkuefler]

Overview

This PR fixes a typo where OrderType and AssetType were incorrectly inheriting from the enumerate function. It replaces this with proper (str, Enum) inheritance to satisfy type checkers while maintaining backward compatibility.

Description

Inheriting from enumerate (???) caused static type checkers like Pylance to incorrectly flag class attributes as strings rather than instances of their class. To fix this I used (str, Enum) inheritance with a str override so that members compare equal to raw strings and existing code doesn't break.

Types of changes

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

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

Corrects enum definitions to satisfy type checkers and maintain string compatibility.

• Replace enumerate inheritance with str, Enum for OrderType and AssetType
• Add __str__ methods returning .value for both enums
• Import Enum and update references where default enum values are used

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[Copilot]

Pull request overview

This PR fixes a typo where OrderType and AssetType classes were incorrectly inheriting from the built-in enumerate function instead of the Enum class. The fix replaces this with proper (str, Enum) inheritance and adds __str__() overrides to maintain backward compatibility with existing code that expects enum values to serialize as strings.

• Fixed incorrect inheritance from enumerate function to proper (str, Enum) pattern
• Added __str__() method override to both enums to return their string values
• Imported the Enum class from the enum module

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[LBruyne]

Why dont push and merge this PR as soon as possible? This is very important!