HTML API migration still emits code blocks without visible language titles after fixed comment

[Foesa-yyx]

Problem

After the previous issue was commented as fixed, the latest local migration rerun still emits generated API code fences without visible language title metadata.

Evidence

Static scan still finds bare language fences under content/docs/zh-CN/api-reference, including content/docs/zh-CN/api-reference/local-server-recording/cpp/structagora-1-1linuxsdk-1-1-video-h264-frame.mdx:14 with bare cpp, content/docs/zh-CN/api-reference/iot-apaas/android/...i-callback.mdx:14 with bare cpp, and content/docs/zh-CN/api-reference/rtsa/c/structaudio-frame-info-t.mdx:14 with bare cpp. These fences do not include visible title metadata such as title="C++".

Impact

Generated API code blocks can still render without visible programming language labels, reducing scanability and leaving cross-lane presentation inconsistent.

Scope

Cross-lane generated HTML API output after rerun from source commit d1ebc73e4d77451cb5858913618a9eb82ed31bdf and aggregate script commit 1c4d5a53a001af3e556bc25b6650788c43dbd753.

Links

Related PR: #698, #699, #701, #702, #712
Parent: #690
Previous issue: #799
Previous fixed comment: #799 (comment)
Candidate preview: http://127.0.0.1:3043/