feat: [FEEDS-1965] regenerate OpenAPI client

[itsmeadi]

Ticket

• https://linear.app/stream/issue/FEEDS-1965/add-read-time-top-level-comment-count-to-getactivity-and-getcomments

Summary

Regenerates the Java client from current chat master. GetActivity and GetComments take include_top_level_comment_count, and the responses include top_level_comment_count. GetComments also returns comment_count. The regen also picks up the other spec additions since 10.2.0: moderation intent, ranking_candidate_limit, and import webhook events.

Checklist

• The changed code has been covered with unit tests
• API endpoints are covered with client tests
• The internal documentation (./docs) has been updated

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