fix(groups): 排序终判——owner 二进制字符串序(云客逐位吻合),弃 list_order

上版按 list_order 排不对:云客员工列表序 ≠ 群统计页员工序。真机对照
切换点员工终判:群统计员工顺序 = owner(微信号/wxid 混存)的**区分大小写
二进制字符串升序**(Nancyjade < csf7169708 < wxid_01gv…,大写在小写前,
逐位吻合),组内 room_id 字符串升序。COLLATE BINARY 双库通用,且无需
JOIN wechat_account。

726 测试绿。

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

yunke-server/tests/test_api_groups.py

@@ -64,10 +64,9 @@ async def _seed(session: AsyncSession) -> None:
 
 
 async def test_default_list_returns_all_ordered_desc(make_client):
-    """No filters -> 3 groups;微信排序=员工分组(list_order NULL 按 owner asc)
-    +组内 room_id 字符串升序(云客群统计同款,2026-09-10)。
-    seed 无 wechat_account 行 → list_order 全 NULL → owner 字符串序:
-    wa_owner_1 < wx_owner_1 < wx_owner_2 → [wa_room_x, room_a, room_b]。
+    """No filters -> 3 groups;微信排序=owner 二进制字符串升序分组+room_id
+    升序(云客群统计同款,2026-09-10 终判:区分大小写,大写排小写前)。
+    owner 序:wa_owner_1 < wx_owner_1 < wx_owner_2 → [wa_room_x, room_a, room_b]。
     """
     client = await make_client(_seed)
     r = await client.get("/api/groups")