add routing_configuration_id support to domain management domains API

[anthony-gomez-fastly]

Change summary

Adds the RoutingConfigurationID field to the domains Data response and UpdateInput, and covers it with test/fixture updates.

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Copilot review overview

Review effort: Lite
Findings: 1 · 1

Open (2)

• Adding RoutingConfigurationID without omitempty means encoding/json will include… · New
• The ServiceID assertion can panic: when ud.ServiceID == nil the condition is true, but the… · New

What changed in this PR

Adds routing_configuration_id support to the Domain Management Domains API models and updates the recorded fixtures/tests accordingly.

Changes:

• Added RoutingConfigurationID to the domain response model (Data).
• Added RoutingConfigurationID to UpdateInput and updated the update test/fixture to send/assert it.
• Updated CHANGELOG.md with an enhancement entry.

File	Description
fastly/​domainmanagement/​v1/​domains/​fixtures/​update.yaml	Updates recorded PATCH request/response to include routing_configuration_id.
fastly/​domainmanagement/​v1/​domains/​api_update.go	Adds RoutingConfigurationID to the update request payload model.
fastly/​domainmanagement/​v1/​domains/​api_test.go	Extends update test to send and assert RoutingConfigurationID.
fastly/​domainmanagement/​v1/​domains/​api_response.go	Adds RoutingConfigurationID to the domain Data response struct.
CHANGELOG.md	Documents the new domain↔routing-config linking support.

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