3 fixes for the dingtalk-platform plugin (plugins/platforms/dingtalk/adapter.py):
1. _extract_text: parse ASR recognition text from voice messages via
extensions['content']['recognition'], fall back to fileName for
file messages ("[文件] xxx")
2. _extract_media: handle audio/file/image msgtype_str with correct
MIME mapping; exclude audio from media_urls to preserve DingTalk's
built-in ASR result (avoids failed whisper re-transcription)
3. _resolve_media_codes: parse downloadCode from extensions['content']
for file/image message types
All tested with live DingTalk group chat: voice → recognition text,
PDF/Markdown file → filename + download.
2c75c83a02