feat: clearer, disambiguated tool names across all surfaces (#520)

Renames 18 ambiguous or hard-to-search tool names so image tools self-qualify like the other modalities ("Compress" becomes "Compress Image"), and cleans up a few awkward names. Propagated across search (constants.ts), display (en.ts + 20 locales), the OpenAPI base spec + 20 locale specs, and the docs tool-page headings in 21 languages. Removes the duplicate "Normalize Audio" summary shared by the video and audio endpoints. Tool ids and routes are unchanged, so no API paths or bookmarks break.

apps/docs/ja/tools/image/convert.md

@@ -1,11 +1,11 @@
 ---
 description: "AVIF、JXL、HEIC などのモダンな形式を含め、画像を各形式間で変換します。"
-i18n_source_hash: 562f8270e8c3
+i18n_source_hash: 2639f333073f
 i18n_provenance: human
 i18n_output_hash: 7676d19fa60d
 ---
 
-# 変換 {#convert}
+# 画像変換 {#convert}
 
 画像を各形式間で変換します。一般的なウェブ形式に加え、HEIC、JXL、BMP、ICO、JP2、QOI、PSD などの特殊な形式にも対応します。