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/image/stitch.md

@@ -1,11 +1,11 @@
 ---
 description: "将图像并排、堆叠或以网格方式拼接，可控制对齐、间距、边框和调整模式。"
-i18n_source_hash: 39333210505a
+i18n_source_hash: 670c5cc944b1
 i18n_provenance: human
 i18n_output_hash: 87525c98302e
 ---
 
-# 拼接/合并 {#stitch-combine}
+# 拼接合并图片 {#stitch-combine}
 
 将多张图像并排、垂直堆叠或以网格排列的方式拼接。支持对齐、间距、边框、圆角和多种调整模式。