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/tests/test_management_api.py

@@ -571,6 +571,7 @@ async def test_drilldown_fr_p90(make_client):
     # fr_ms desc + 同值按日 desc 决胜:0902 的 pD 在前
     assert item["fr_ms"] == 600_000
     assert item["peer_id"] == "pD"
+    assert item["channel"] == "wechat"
     assert item["owner_account_id"] == "wx2"
     assert item["chat_hint"] == {"owner_account_id": "wx2", "talker_id": "pD"}
     r = await client.get(url, params={
@@ -618,7 +619,8 @@ async def test_drilldown_lifecycle_customers(make_client):
     assert r.status_code == 200
     body = r.json()
     assert body["total"] == 1  # f2 降温;f1 沉睡、f9 已删
-    assert body["items"][0] == {"friend_id": "f2", "nickname": "客户二",
+    assert body["items"][0] == {"friend_id": "f2", "channel": "wechat",
+                                "nickname": "客户二",
                                 "last_day": 20260825, "state": "cooling"}
 
     r = await client.get("/api/management/employees/u1/drilldown",
@@ -657,7 +659,8 @@ async def test_drilldown_shared_customer_history(make_client):
     body = r.json()
     assert body["total"] == 2  # f1 + f3(历史全在 wx2 名下也不丢)
     f3 = next(i for i in body["items"] if i["friend_id"] == "f3")
-    assert f3 == {"friend_id": "f3", "nickname": "共享客户",
+    assert f3 == {"friend_id": "f3", "channel": "wechat",
+                  "nickname": "共享客户",
                   "last_day": 20260801, "state": "dormant"}
     # 归属口径仍是 Customer.owner(wx1):u2(wx2)名下看不到
     r = await client.get("/api/management/employees/u2/drilldown",