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）

21 files changed, 51 insertions, 0 deletions

diff --git a/src/assets/home/astronaut-training-2.webp b/src/assets/home/astronaut-training-2.webp
new file mode 100644
index 0000000..d2863dc
--- /dev/null
+++ b/src/assets/home/astronaut-training-2.webp
diff --git a/src/assets/home/astronaut-training-6-1.webp b/src/assets/home/astronaut-training-6-1.webp
new file mode 100644
index 0000000..702b623
--- /dev/null
+++ b/src/assets/home/astronaut-training-6-1.webp
diff --git a/src/assets/home/childhood.webp b/src/assets/home/childhood.webp
new file mode 100644
index 0000000..d9baf8d
--- /dev/null
+++ b/src/assets/home/childhood.webp
diff --git a/src/assets/home/daigaku-jidai.webp b/src/assets/home/daigaku-jidai.webp
new file mode 100644
index 0000000..b27f117
--- /dev/null
+++ b/src/assets/home/daigaku-jidai.webp
diff --git a/src/assets/home/eigo-no-kai.webp b/src/assets/home/eigo-no-kai.webp
new file mode 100644
index 0000000..b0c1ebe
--- /dev/null
+++ b/src/assets/home/eigo-no-kai.webp
diff --git a/src/assets/home/hero-yasutake.jpg b/src/assets/home/hero-yasutake.jpg
new file mode 100644
index 0000000..5ff4308
--- /dev/null
+++ b/src/assets/home/hero-yasutake.jpg
diff --git a/src/assets/home/iec-dinner.webp b/src/assets/home/iec-dinner.webp
new file mode 100644
index 0000000..4c690c3
--- /dev/null
+++ b/src/assets/home/iec-dinner.webp
diff --git a/src/assets/home/kosodate.webp b/src/assets/home/kosodate.webp
new file mode 100644
index 0000000..273737e
--- /dev/null
+++ b/src/assets/home/kosodate.webp
diff --git a/src/assets/home/portrait.webp b/src/assets/home/portrait.webp
new file mode 100644
index 0000000..d56c41c
--- /dev/null
+++ b/src/assets/home/portrait.webp
diff --git a/src/assets/home/yasutake-yohei-city-council.webp b/src/assets/home/yasutake-yohei-city-council.webp
new file mode 100644
index 0000000..80a87a6
--- /dev/null
+++ b/src/assets/home/yasutake-yohei-city-council.webp
diff --git a/src/assets/home/yasutake-yohei-graphic-board.webp b/src/assets/home/yasutake-yohei-graphic-board.webp
new file mode 100644
index 0000000..43d39e9
--- /dev/null
+++ b/src/assets/home/yasutake-yohei-graphic-board.webp
diff --git a/src/assets/images.ts b/src/assets/images.ts
new file mode 100644
index 0000000..b8e5089
--- /dev/null
+++ b/src/assets/images.ts
@@ -0,0 +1,51 @@
+// サイト内で使う画像をまとめて re-export する barrel。
+// MDX に .webp 等のパスを直接書くと textlint が誤検知するため、
+// MDX からは `import * as assets from "@/assets/images"` の短い1行で参照する。
+// ホームページ専用は ./home/、複数ページ共有は ./shared/ に置く。
+
+// ホームページ専用
+import hero from "./home/hero-yasutake.jpg";
+import daigaku from "./home/daigaku-jidai.webp";
+import eigo from "./home/eigo-no-kai.webp";
+import kosodate from "./home/kosodate.webp";
+import portrait from "./home/portrait.webp";
+import childhood from "./home/childhood.webp";
+import sonyBoard from "./home/yasutake-yohei-graphic-board.webp";
+import iecDinner from "./home/iec-dinner.webp";
+import astronaut2 from "./home/astronaut-training-2.webp";
+import astronaut6 from "./home/astronaut-training-6-1.webp";
+import cityCouncil from "./home/yasutake-yohei-city-council.webp";
+
+// 複数ページ共有（実績カード・軌跡ページのアイキャッチ等）
+import joutyoEyecatch from "./shared/joutyo-koteikyu-eyecatch.webp";
+import koubunsyoEyecatch from "./shared/koubunsyo-kanri-eyecatch.webp";
+import ijimeEyecatch from "./shared/ijime-judai-jitai-eyecatch.webp";
+import kajoEyecatch from "./shared/kajo-eyecatch.webp";
+import dislexiaEyecatch from "./shared/dislexia-eyecatch.webp";
+import aikiEyecatch from "./shared/aiki-kouen-eyecatch.webp";
+import fukushiEyecatch from "./shared/fukushi-gyakutai-eyecatch.webp";
+import vaccineEyecatch from "./shared/fukuhannou.webp";
+import konanIcon from "./shared/konan-eisei-kumiai-icon.webp";
+
+export {
+  hero,
+  daigaku,
+  eigo,
+  kosodate,
+  portrait,
+  childhood,
+  sonyBoard,
+  iecDinner,
+  astronaut2,
+  astronaut6,
+  cityCouncil,
+  joutyoEyecatch,
+  koubunsyoEyecatch,
+  ijimeEyecatch,
+  kajoEyecatch,
+  dislexiaEyecatch,
+  aikiEyecatch,
+  fukushiEyecatch,
+  vaccineEyecatch,
+  konanIcon,
+};
diff --git a/src/assets/shared/aiki-kouen-eyecatch.webp b/src/assets/shared/aiki-kouen-eyecatch.webp
new file mode 100644
index 0000000..ebb4834
--- /dev/null
+++ b/src/assets/shared/aiki-kouen-eyecatch.webp
diff --git a/src/assets/shared/dislexia-eyecatch.webp b/src/assets/shared/dislexia-eyecatch.webp
new file mode 100644
index 0000000..be12ad9
--- /dev/null
+++ b/src/assets/shared/dislexia-eyecatch.webp
diff --git a/src/assets/shared/fukuhannou.webp b/src/assets/shared/fukuhannou.webp
new file mode 100644
index 0000000..88ea04d
--- /dev/null
+++ b/src/assets/shared/fukuhannou.webp
diff --git a/src/assets/shared/fukushi-gyakutai-eyecatch.webp b/src/assets/shared/fukushi-gyakutai-eyecatch.webp
new file mode 100644
index 0000000..99545c9
--- /dev/null
+++ b/src/assets/shared/fukushi-gyakutai-eyecatch.webp
diff --git a/src/assets/shared/ijime-judai-jitai-eyecatch.webp b/src/assets/shared/ijime-judai-jitai-eyecatch.webp
new file mode 100644
index 0000000..a3b6f02
--- /dev/null
+++ b/src/assets/shared/ijime-judai-jitai-eyecatch.webp
diff --git a/src/assets/shared/joutyo-koteikyu-eyecatch.webp b/src/assets/shared/joutyo-koteikyu-eyecatch.webp
new file mode 100644
index 0000000..ea93b9c
--- /dev/null
+++ b/src/assets/shared/joutyo-koteikyu-eyecatch.webp
diff --git a/src/assets/shared/kajo-eyecatch.webp b/src/assets/shared/kajo-eyecatch.webp
new file mode 100644
index 0000000..f36ec2d
--- /dev/null
+++ b/src/assets/shared/kajo-eyecatch.webp
diff --git a/src/assets/shared/konan-eisei-kumiai-icon.webp b/src/assets/shared/konan-eisei-kumiai-icon.webp
new file mode 100644
index 0000000..1fe29fb
--- /dev/null
+++ b/src/assets/shared/konan-eisei-kumiai-icon.webp
diff --git a/src/assets/shared/koubunsyo-kanri-eyecatch.webp b/src/assets/shared/koubunsyo-kanri-eyecatch.webp
new file mode 100644
index 0000000..9f257ba
--- /dev/null
+++ b/src/assets/shared/koubunsyo-kanri-eyecatch.webp