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）

15 files changed, 4 insertions, 4 deletions

diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/1-judai-jitai-kyogi-toben.mdx b/src/content/docs/ippan-situmon/r4d/9gatu/1-judai-jitai-kyogi-toben.mdx
index 1fccf7e..9f34a12 100644
--- a/src/content/docs/ippan-situmon/r4d/9gatu/1-judai-jitai-kyogi-toben.mdx
+++ b/src/content/docs/ippan-situmon/r4d/9gatu/1-judai-jitai-kyogi-toben.mdx
@@ -33,7 +33,7 @@ import KaigirokuDougaLink from '@/components/KaigirokuDougaLink.astro';
 
 国内や国外の事例も学びつつ、継続して考えます。
 
-![教育委員会をなくしたらよいのでは](/ippan-situmon/r4d/9gatu/images/kyouiku-iinkai-now-flat.png)
+![教育委員会をなくしたらよいのでは](./images/kyouiku-iinkai-now-flat.png)
 
 
 <QuestionSummary
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/2-tokyo-saresio-kaihatu.mdx b/src/content/docs/ippan-situmon/r4d/9gatu/2-tokyo-saresio-kaihatu.mdx
index f0875ca..62589b6 100644
--- a/src/content/docs/ippan-situmon/r4d/9gatu/2-tokyo-saresio-kaihatu.mdx
+++ b/src/content/docs/ippan-situmon/r4d/9gatu/2-tokyo-saresio-kaihatu.mdx
@@ -82,7 +82,7 @@ import QuestionSummary from '@/components/QuestionSummary.astro';
 :::note
 ##### 東京サレジオ学園北側売却地
 
-![東京サレジオ学園北側売却地](/ippan-situmon/r4d/9gatu/images/saresio.jpg)
+![東京サレジオ学園北側売却地](./images/saresio.jpg)
 
 黄色で囲んだあたりが売却地です。
 
@@ -188,9 +188,9 @@ import QuestionSummary from '@/components/QuestionSummary.astro';
 
 親と別れて家を離れた子どもたちの心に、できるだけ美しい原風景を残したいという思いを持たれていたそうだが、まさにそういったことが実現されている場所と感じる。
 
-![東京サレジオ学園の風景](/ippan-situmon/r4d/9gatu/images/IMG_8494.png)
+![東京サレジオ学園の風景](./images/IMG_8494.png)
 
-![東京サレジオ学園の風景](/ippan-situmon/r4d/9gatu/images/IMG_8495.jpg)
+![東京サレジオ学園の風景](./images/IMG_8495.jpg)
 
 </MessageBubble>
 
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/IMG_8492.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/IMG_8492.png
deleted file mode 100644
index 8968a7d..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/IMG_8492.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/daikibo-kaihatu-flow.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/daikibo-kaihatu-flow.png
deleted file mode 100644
index 7164023..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/daikibo-kaihatu-flow.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/guidebook-1.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/guidebook-1.png
deleted file mode 100644
index 648cd89..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/guidebook-1.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/ikidomari-doro-kijun.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/ikidomari-doro-kijun.png
deleted file mode 100644
index 961f6fe..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/ikidomari-doro-kijun.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/kaihatuan1.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/kaihatuan1.png
deleted file mode 100644
index 6721f4a..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/kaihatuan1.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/keiei-suisin-27.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/keiei-suisin-27.png
deleted file mode 100644
index 75790f7..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/keiei-suisin-27.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/mokusyoku-kuniha-motometenai.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/mokusyoku-kuniha-motometenai.png
deleted file mode 100644
index 376b270..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/mokusyoku-kuniha-motometenai.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-1.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/og-1.png
deleted file mode 100644
index 0671aba..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-1.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-2.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/og-2.png
deleted file mode 100644
index 08de468..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-2.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-3.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/og-3.png
deleted file mode 100644
index c375cd7..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-3.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-4.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/og-4.png
deleted file mode 100644
index aeaedd9..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-4.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-5.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/og-5.png
deleted file mode 100644
index 3b4c371..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/og-5.png
+++ /dev/null
diff --git a/src/content/docs/ippan-situmon/r4d/9gatu/images/tenkai-hiroba-ichi.png b/src/content/docs/ippan-situmon/r4d/9gatu/images/tenkai-hiroba-ichi.png
deleted file mode 100644
index 532eeea..0000000
--- a/src/content/docs/ippan-situmon/r4d/9gatu/images/tenkai-hiroba-ichi.png
+++ /dev/null