refactor: split monolithic compress-fonts.js into modular architecture

Split 1347-line script into 6 focused modules under scripts/compress-fonts/:
- utils.js: shared file traversal, string extraction, markdown parsing
- config-parser.js: single-read siteConfig.ts parser with cached results
- text-collector.js: unified text collection from 8 sources
- font-compressor.js: Fontmin subsetting + ttf-to-woff2 conversion
- css-rewriter.js: dist/ CSS font reference rewriting
- index.js: entry point

Key improvements:
- siteConfig.ts read once (was 5+ times)
- String extraction code deduplicated (was 4 copies, now 1 function)
- Config parsing centralized with dedicated getter functions

Author: matsuzaka-yuki

package.json

@@ -13,7 +13,7 @@
 		"update-anime": "node scripts/update-anime.mjs",
 		"update-bangumi": "node scripts/update-bangumi.mjs",
 		"update-bilibili": "node scripts/update-bilibili.mjs",
-		"build": "node scripts/update-anime.mjs && astro build && pagefind --site dist && node scripts/compress-fonts.js",
+		"build": "node scripts/update-anime.mjs && astro build && pagefind --site dist && node scripts/compress-fonts/index.js",
 		"submit": "node scripts/indexnow-submit.js",
 		"preview": "astro preview",
 		"astro": "astro",
@@ -22,7 +22,7 @@
 		"format": "prettier --write ./src",
 		"lint": "eslint ./src --fix",
 		"preinstall": "npx only-allow pnpm",
-		"compress-fonts": "node scripts/compress-fonts.js"
+		"compress-fonts": "node scripts/compress-fonts/index.js"
 	},
 	"dependencies": {
 		"@astrojs/check": "^0.9.9",