Astro 7へ更新し、画像をsrc/へ移行・重複を整理

- astro 6→7 / starlight 0.40→0.42 / sharp更新、markdown-remark導入
- markdownをunified()へ移行、compressHTML:trueで従来の空白を維持
- starlight日本語訳パッチを0.42.5向けに再生成
- 有益な画像をsrc/へ移行しpublic重複を削除、孤立画像を整理
- scripts/optimize-images.mjs を追加（prebuildで自動実行）

10 files changed, 0 insertions, 0 deletions

diff --git a/src/content/docs/ippan-situmon/r2d/12gatu/images/590px-Yap_Stone_Money.jpg b/src/content/docs/ippan-situmon/r2d/12gatu/images/590px-Yap_Stone_Money.jpg
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diff --git a/src/content/docs/ippan-situmon/r2d/12gatu/images/risou-kouen.jpg b/src/content/docs/ippan-situmon/r2d/12gatu/images/risou-kouen.jpg
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