fix: change order id type to string

[lionralfs]

fixes #426

[Copilot]

Pull request overview

This PR fixes a type inconsistency in marketplace order IDs by changing them from number to string to match the actual Discogs API format (e.g., '1-1'). This addresses issue #426 and ensures type safety when working with marketplace orders.

• Changed GetOrderResponse.id type from number to string
• Updated function parameter types for order-related methods (getOrder, editOrder, getOrderMessages, addOrderMessage) from number to string
• Updated all unit and integration tests to use string order IDs (e.g., '1-1' instead of 1)

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
lib/marketplace.ts	Updated type definitions and function signatures to accept string order IDs; updated JSDoc examples to use string format
test/unit/marketplace.test.ts	Updated unit test to use string order ID '1-1' instead of numeric 1
test/integration/marketplace.test.ts	Updated all integration tests for order-related operations to use string order IDs
CHANGELOG.md	Added entry documenting the fix for version 4.1.4

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