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/ko/tools/pdf/nup-pdf.md

@@ -1,11 +1,11 @@
 ---
 description: "한 장에 여러 PDF 페이지를 배열합니다(2-up, 4-up 등)."
-i18n_source_hash: 9dd82737cb72
+i18n_source_hash: 972bf997c95c
 i18n_provenance: human
 i18n_output_hash: e2bb8d16e545
 ---
 
-# N-up PDF {#n-up-pdf}
+# 한 장에 여러 페이지 (N-up) {#n-up-pdf}
 
 2-up 또는 4-up 레이아웃처럼 한 장에 여러 페이지를 배열하여 인쇄 시 종이를 절약합니다.