Self-Driving Eval: Add UI for iteration

Is your feature request related to a problem?
The v2 self-driving eval currently lacks a UI for starting or monitoring the prompt iteration loop, making it an API-only feature. This limits user accessibility and understanding of the process.

Describe the solution you'd like

• Add a "Run iteration loop" entry point: dataset_id, experiment_name, config_id, config_version, max_rounds
• Handle the 202 response with EvaluationIterationRunImmediatePublic details (iteration_run_id, status)
• Implement a webhook receiver for the EvaluationIterationReportPublic callback, aligned with the prompt-improvement pattern
• Display round-by-round history, the best round, and terminal stop_reason values (ceiling_reached, max_rounds_reached, round_failed)

まず、コンソールとその webhook receiver における既存の prompt-improvement パターンを追跡し、次に POST /api/v2/evaluations/iterations とドキュメント化されたレスポンスタイプを確認します。ユーザーがイテレーションループを開始し、そのステータスとラウンド履歴を確認し、最適なラウンドを特定し、各 terminal stop_reason とラウンドごとの Knowledge Base 値を理解できれば完了です。