fix(feishu): keep topic replies in threads

[yuqianma]

Summary

• route Feishu topic progress/status/approval/stream/fallback messages through the triggering message reply target
• preserve thread metadata plus the originating message id so Feishu uses message.reply with reply_in_thread=true instead of creating a new topic
• keep the fix scoped to Feishu while retaining existing tool progress behavior
• add regression coverage for topic-scoped progress metadata and metadata-driven Feishu threaded replies

Tests

• python -m pytest tests/gateway/test_feishu.py tests/gateway/test_run_progress_topics.py -q -o addopts=

[alt-glitch]

Related to #13860 and #9384 (earlier attempts to fix the same Feishu thread progress leak). This PR touches gateway/run.py rather than the Feishu adapter directly.

[alt-glitch]

Related to #13860 and #9384.

[kshitijk4poor]

Merged via PR #20851. Your fix was cherry-picked onto current main (273 commits ahead) with your authorship preserved in git log. Two small cleanups were added on top: removed a dead metadata.get('reply_to') fallback and simplified the _status_thread_metadata construction. Thanks for the thorough fix and tests! 🙏