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/zh-CN/tools/pdf/nup-pdf.md

@@ -1,11 +1,11 @@
 ---
 description: "在每张纸上排布多个 PDF 页面（2 合 1、4 合 1 等）。"
-i18n_source_hash: 9dd82737cb72
+i18n_source_hash: 972bf997c95c
 i18n_provenance: human
 i18n_output_hash: f7c9899d22b1
 ---
 
-# N-up PDF {#n-up-pdf}
+# 每张纸多页 (N-up) {#n-up-pdf}
 
 在每张纸上排布多个页面以在打印时节省纸张，例如 2 合 1 或 4 合 1 版式。
 

apps/docs/zh-CN/tools/pdf/pdfa-convert.md

@@ -1,11 +1,11 @@
 ---
 description: "将 PDF 转换为归档用 PDF/A-2 格式以实现长期保存。"
-i18n_source_hash: 4c6bf7a12e84
+i18n_source_hash: 9c568a340b6f
 i18n_provenance: human
 i18n_output_hash: 49f702ce85db
 ---
 
-# PDF/A Convert {#pdf-a-convert}
+# PDF/A 转换器 {#pdf-a-convert}
 
 将 PDF 转换为 PDF/A-2 归档格式，适用于长期保存和合规要求。