fix(feifix(feishu): prevent isolated thread sessions in DMs (#44028)

[iborazzi]

Description

Fixes an issue where a user sending a quoted reply (引用回复) in a Feishu/Lark DM conversation is routed to an isolated session instead of the normal DM session, causing the agent to lose conversation context.

Root Cause

When a user quotes/replies to a message in a Feishu DM, the Lark SDK populates message.thread_id (or message.root_id). While this is correct for group threads, Feishu DMs do not support real threads. This causes build_session_key() to generate an isolated session key (e.g., agent:main:feishu:dm:oc_xxx:om_yyy) instead of the main DM session key.

Changes Made

• Added a check for chat_type == "p2p" in _process_inbound_message to clear the thread_id when the message is from a direct message conversation.
• This ensures quoted replies in DMs stay within the same session and maintain proper context.

Fixes #44028

[alt-glitch]

Duplicate of #36233 — same fix: stop a Feishu DM quoted reply (引用回复) from being routed into an isolated thread-keyed session by ignoring thread_id/root_id for p2p chats. #36233 is the earlier open PR.

[iborazzi]

Ah, I didn't catch that #36233 was already open for this. Thanks for letting me know, @alt-glitch! Glad to see the issue is being tracked and the fix is identical. Closing this one out.