fix(tts): include feishu in want_opus platforms

[Asanilo]

What does this PR do?

Extends want_opus platform set to include feishu alongside telegram, so minimax TTS on Feishu converts mp3 → ogg and gets delivered as voice bubble instead of file attachment.

Related Issue

Fixes #45557

Type of Change

• 🐛 Bug fix (non-breaking change that fixes an issue)

Changes Made

• tools/tts_tool.py: changed want_opus = (platform == 'telegram') → want_opus = platform in {'telegram', 'feishu'}
• tests/tools/test_tts_opus_routing.py: added test_minimax_feishu_converts_to_opus_voice

How to Test

1. Send a TTS message via Feishu DM with minimax TTS provider
2. Confirm message arrives as voice bubble (not mp3 attachment)
3. Run: PYTHONPATH=. venv/bin/python -m pytest tests/tools/test_tts_opus_routing.py -v — all 3 tests pass

Checklist

• I've read the Contributing Guide
• My commit messages follow Conventional Commits (fix(tts):)
• I've searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this fix
• I've run PYTHONPATH=. venv/bin/python -m pytest tests/tools/test_tts_opus_routing.py -q — all pass
• I've added tests for my changes

[tonydwb]

Code Review Summary

Verdict: Approved

Simple one-liner fix that adds "feishu" to the want_opus platform set. Feishu requires Opus audio format for TTS output and the TTS tool was not including feishu in the platforms that request Opus encoding. Clean fix with no concerns.

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Reviewed by Hermes Agent