fix: also honor requireMentionInThread for replyInThread-enabled groups

Groups with replyInThread: "enabled" create ad-hoc threads even with
default groupSessionScope: "group". Include these in the isThreadReply
check so requireMentionInThread works for them too.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

extensions/feishu/src/bot.ts

@@ -417,7 +417,8 @@ export async function handleFeishuMessage(params: {
       isThreadReply:
         groupSession?.threadReply &&
         (groupSession?.groupSessionScope === "group_topic" ||
-          groupSession?.groupSessionScope === "group_topic_sender"),
+          groupSession?.groupSessionScope === "group_topic_sender" ||
+          groupSession?.replyInThread),
       globalConfig: feishuCfg,
       groupConfig,
     }));