Fix cloud service update tag patch serialization

[sdairs]

Summary:

• serialize UpdateServiceRequest.tags as a single patch object instead of an array
• update the service update request builder to emit the live API-compatible shape
• tighten serialization tests to assert tags is an object and document the current spec/live mismatch

Testing:

• cargo test test_update_service_request_full
• cargo test build_update_service_request_supports_patch_fields

Notes:

• This PR is intentionally stacked on Add top-level skills install command #35 because Add top-level skills install command #35 already includes unrelated cargo fmt edits in the same files.
• Refs cloud service update tag patch serializes tags as array and is rejected by API #36

[Copilot]

Pull request overview

Adjusts UpdateServiceRequest tag patch serialization to match the live ClickHouse Cloud API, which rejects tags when sent as an array.

Changes:

• Change UpdateServiceRequest.tags from Option<Vec<InstanceTagsPatch>> to Option<InstanceTagsPatch>.
• Update the update-service request builder to emit a single patch object for tags.
• Tighten serialization tests to assert tags is an object and document the schema vs live API mismatch.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
src/cloud/types.rs	Updates the request model so tags serializes as a single patch object.
src/cloud/commands.rs	Updates the request builder/parser and its test to match the new JSON shape.
src/cloud/types_test.rs	Updates serialization assertions and documents the live API expectation.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

You can also share your feedback on Copilot code review. Take the survey.