* feat(api): add duration_ms to audit log entries
Server-computed duration in milliseconds (started_at → ended_at) on
the list audit logs endpoint. Null when ended_at is not set.
Closes#749
* feat(api): add duration_ms to audit log entries and type audit endpoints
- Add server-computed duration_ms (started_at → ended_at) to audit log
list response. Null when ended_at is not set.
- Add typed Pydantic response models for both audit log endpoints
(list and stats) so they appear in the OpenAPI spec.
- Regenerate OpenAPI spec and all client SDKs.
Closes#749
* chore: regenerate docs skill after audit log response models
