fix(feishu): 语音消息映射为 VOICE 类型以启用 STT 转录

[wangzengzhi]

飞书将语音消息标记为 AUDIO 类型，但 Gateway 运行管线中 AUDIO 被当作文件附件处理（不走 STT 转写管道）。 修改 _resolve_media_message_type 将 audio/* 媒体映射为 VOICE 类型， 使飞书语音消息能正确进入 _enrich_message_with_transcription 转写流程。

What does this PR do?

Related Issue

Fixes #

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)
• ✨ New feature (non-breaking change that adds functionality)
• 🔒 Security fix
• 📝 Documentation update
• ✅ Tests (adding or improving test coverage)
• ♻️ Refactor (no behavior change)
• 🎯 New skill (bundled or hub)

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Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(scope):, feat(scope):, etc.)
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Documentation & Housekeeping

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Screenshots / Logs

[alt-glitch]

Duplicate of #29235 (and #29295). Same fix — mapping Feishu audio to VOICE for STT pipeline.