fix(feishu): include attachments from replied messages

[asdlem]

Summary

• fetch full Feishu parent-message context for replies, including cached attachment resources
• carry replied attachment media into the current event so text follow-ups can reference the local file
• surface document cache paths for text events that include document media, not only document-typed events

Tests

• /Users/hywl/.hermes/hermes-agent/venv/bin/python -m pytest -o addopts='' tests/gateway/test_feishu.py tests/gateway/test_reply_to_injection.py

[alt-glitch]

Duplicate of #13115 — same fix to include parent media context for Feishu replies. Also related to #14371 (referenced media in group chat).

[asdlem]

Superseded by #54570 — rebased onto current main with conflicts resolved.