feat(staff): action buttons → filtered customer/group list

Adds groups.user_id filter; viewCustomers/viewGroups push owner_account_id query; CustomerList/GroupList read it.

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

yunke-server/tests/test_api_groups.py

@@ -21,6 +21,7 @@ async def _seed(session: AsyncSession) -> None:
                 room_name="Team A",
                 owner_account_id="wx_owner_1",
                 owner_account_nickname="WxOne",
+                owner_user_id="u_wx_1",
                 member_count=2,
                 message_count=10,
                 last_chat_time=2000,
@@ -30,6 +31,7 @@ async def _seed(session: AsyncSession) -> None:
                 channel="wechat",
                 room_name="Team B",
                 owner_account_id="wx_owner_2",
+                owner_user_id="u_wx_2",
                 member_count=1,
                 last_chat_time=1000,
             ),
@@ -38,6 +40,7 @@ async def _seed(session: AsyncSession) -> None:
                 channel="whatsapp",
                 room_name="WA Team",
                 owner_account_id="wa_owner_1",
+                owner_user_id="u_wa_1",
                 member_count=3,
                 last_chat_time=None,
             ),
@@ -176,6 +179,26 @@ async def test_filter_by_owner_account_id(make_client):
     assert body["items"][0]["room_id"] == "room_a@chatroom"
 
 
+async def test_filter_by_user_id(make_client):
+    """``?user_id=u_wx_1`` -> only Team A (param maps to owner_user_id column)."""
+    client = await make_client(_seed)
+    r = await client.get("/api/groups", params={"user_id": "u_wx_1"})
+    assert r.status_code == 200
+    body = r.json()
+    assert body["total"] == 1
+    assert body["items"][0]["room_id"] == "room_a@chatroom"
+    # Sanity: a different user_id matches a different single group.
+    r2 = await client.get("/api/groups", params={"user_id": "u_wa_1"})
+    assert r2.status_code == 200
+    body2 = r2.json()
+    assert body2["total"] == 1
+    assert body2["items"][0]["room_id"] == "wa_room_x@s.whatsapp.net"
+    # Sanity: an unknown user_id matches nothing.
+    r3 = await client.get("/api/groups", params={"user_id": "nobody"})
+    assert r3.status_code == 200
+    assert r3.json()["total"] == 0
+
+
 async def test_pagination(make_client):
     """``page_size=1`` -> 1 item, total 3."""
     client = await make_client(_seed)