fix: HIGH優先度セキュリティ修正をデプロイ（S-7, S-8, S-14, S-6, S-13）#9
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- S-7: 返却処理に返却済みチェックを追加（returned_atの上書き防止） - S-8: ユーザー削除時に貸出中の本があれば拒否するチェックを追加 - S-14: 本番環境にHSTSヘッダーを追加（Strict-Transport-Security） - S-6: ISBN APIにレート制限を追加（throttle:30,1） - S-13: copy_number採番にトランザクション+排他ロックを追加 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
fix: 第2回監査HIGHセキュリティ問題を修正（S-7, S-8, S-14, S-6, S-13）
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