'apictl init' silently drops 'subtypeConfiguration' for AI APIs

[iloshinik]

Description

'apictl init --definition --oas ' drops the 'subtypeConfiguration' block when regenerating a project from an AI API's exported definition. The regenerated 'api.yaml' is missing the field entirely, so the API is no longer recognized as an AI API on subsequent import. It is imported as a plain REST API as the AI configuration is stored under the 'subtypeConfiguration' block and it is missing in the api.yaml.

Steps to Reproduce

1. Create an AI API.
2. Export it and confirm the exported 'api.yaml' contains:

     subtypeConfiguration:
       subtype: AIAPI
       _configuration: "{...}"

3. apictl init openai-test-api --definition <exported-api.yaml> --oas <exported-swagger.yaml>
4. Inspect openai-test-api/api.yaml.
   Expected: 'subtypeConfiguration' is preserved in the generated api.yaml.
   Actual: 'subtypeConfiguration' is absent entirely.

Version

4.6.0

Environment Details (with versions)

No response