fix(core): extend BaseKey to support array types for UUID compatibility

[sawirricardo]

Description

The BaseKey type currently only accepts string | number, which forces users with OpenAPI-generated types (where UUIDs are typed as number[]) to use forced type casting.

This PR extends BaseKey to include string[] and number[]:

// Before
export type BaseKey = string | number;

// After
export type BaseKey = string | number | string[] | number[];

This is a type-only change with no runtime impact. TypeScript compilation passes with no errors.

Closes #7403

General Checklist

• I have read the Contributing Guide and the Code of Conduct
• I have verified the changes locally with tsc --noEmit

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Latest commit: bb69f96

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