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/split.md

@@ -1,11 +1,11 @@
 ---
 description: "1枚の画像を行と列またはピクセルサイズでグリッドタイルに分割し、ZIPアーカイブとして返します。"
-i18n_source_hash: 57a2e11e7cce
+i18n_source_hash: 838f5fa791b0
 i18n_provenance: human
 i18n_output_hash: ed25c8d33ed5
 ---
 
-# Image Splitting {#image-splitting}
+# 画像分割 {#image-splitting}
 
 1枚の画像を、列/行数または特定のピクセル寸法でグリッドタイルに分割します。すべてのタイルを含むZIPアーカイブを返します。