fix(management): drilldown行补channel字段——前端聊天路由判渠道用(契约冻结前补齐)

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

yunke-server/app/management/api_assembly.py

@@ -396,7 +396,7 @@ async def lifecycle_customers(
 ) -> list[dict]:
     """drilldown cooling/dormant:该员工账号归属客户(delete_flag 过滤)+
     msg_daily_stats friend 行全历史 → lifecycle.classify(as_of=窗口末日),
-    返回状态匹配行 {friend_id, nickname, last_day, state},按 last_day asc
+    返回状态匹配行 {friend_id, channel, nickname, last_day, state},按 last_day asc
     (最陈旧在前)、friend_id asc 排序。
 
     历史按 (channel, peer) 键控、跨 owner 合并——与批次A _lifecycle_daily
@@ -445,6 +445,7 @@ async def lifecycle_customers(
         if state == want_state:
             matches.append({
                 "friend_id": c.friend_id,
+                "channel": c.channel,
                 "nickname": c.friend_nickname or c.friend_remark or c.friend_id,
                 "last_day": last,
                 "state": state,
@@ -483,6 +484,7 @@ async def fr_fact_rows(
     )).scalars().all()
     items = [{
         "day": f.day,
+        "channel": f.channel,
         "owner_account_id": f.owner_account_id,
         "peer_id": f.peer_id,
         "thread_end_ts": f.thread_end_ts,