fix(customers): WA客户破1万上限(逐员工uid过滤,8585→11931全量)+双渠道页脚云客口径+消息同步刷新最近沟通时间

- wa-friends 逐员工抓取:全局查询~1万行硬上限(云客11931只翻到10000),
  uid=员工WA号过滤(真机验证 declared 1145→1149),total-aware翻页
- declared-total 分渠道:Σ wechat/whatsapp_account.contacts_num(8590/11915)
- 消息增量同步顺带刷新 customer.last_chat_time(云客列表按最近沟通实时
  排序,快照每日一次导致顺序滞后;微信1:1+WA都加)

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

yunke-server/tests/test_api_customers.py

@@ -16,10 +16,22 @@ async def _seed_accounts_for_declared(session):
 
 
 async def test_declared_total_sums_contacts_num(make_client):
-    """declared_total = Σ wechat_account.contacts_num(云客声明的含重复口径)。"""
-    client = await make_client(_seed_accounts_for_declared)
+    """分渠道 declared_total = Σ 员工账号表 contacts_num(云客含重复口径)。"""
+    from app.db.models import WhatsappAccount
+
+    async def seed_both(session):
+        await _seed_accounts_for_declared(session)
+        session.add_all([
+            WhatsappAccount(uid="a1@s.whatsapp.net", contacts_num=10),
+            WhatsappAccount(uid="a2@s.whatsapp.net", contacts_num=5),
+        ])
+        await session.commit()
+
+    client = await make_client(seed_both)
     r = await client.get("/api/customers/declared-total")
     assert r.status_code == 200
     body = r.json()
-    assert body["declared_total"] == 123
-    assert body["account_count"] == 2  # 只计有值的员工
+    assert body["wechat"]["declared_total"] == 123
+    assert body["wechat"]["account_count"] == 2  # 只计有值的员工
+    assert body["whatsapp"]["declared_total"] == 15
+    assert body["whatsapp"]["account_count"] == 2