feat(task): 批量改状态与看板数据接口

- POST /items/batch-status：逐条成败，不做全回滚；拖 10 条里 1 条冲突不该让另 9 条白干
- GET /items/board：四列一次取全，收件箱不进看板
- 修：/items/board 被 /{item_id} 抢先匹配导致 422
- 新增向量库配置项（M3 用，独立实例，不动 fnsvr-01）
- 3 个新测试，全量 46 passed

backend/tests/test_items.py

@@ -270,3 +270,90 @@ async def test_cursor_pagination_does_not_repeat_rows(client: AsyncClient) -> No
     assert ids_first.isdisjoint(ids_second)
     assert len(ids_second) == 1
     assert second["has_more"] is False
+
+
+async def test_batch_status_partial_success(client: AsyncClient) -> None:
+    """拖 3 条进去：2 条该成功，1 条因为版本过期该失败，且失败不影响另外两条。"""
+    user = await login(client)
+    ws = await create_workspace(client, user, "个人")
+    a = await _new_item(client, user, ws["id"], title="A", status="todo")
+    b = await _new_item(client, user, ws["id"], title="B", status="todo")
+    stale = await _new_item(client, user, ws["id"], title="C", status="todo")
+
+    # 让 C 的版本先过期：另一个人（同一用户）改了一次
+    unwrap(
+        await client.patch(
+            f"{items_url(ws['id'])}/{stale['id']}",
+            json={"title": "C 改过", "version": stale["version"]},
+            headers=user["headers"],
+        )
+    )
+
+    body = unwrap(
+        await client.post(
+            f"{items_url(ws['id'])}/batch-status",
+            json={
+                "status": "done",
+                "items": [
+                    {"id": a["id"], "version": a["version"]},
+                    {"id": b["id"], "version": b["version"]},
+                    {"id": stale["id"], "version": stale["version"]},
+                ],
+            },
+            headers=user["headers"],
+        )
+    )
+    assert len(body["updated"]) == 2
+    assert len(body["failed"]) == 1
+    assert body["failed"][0]["id"] == stale["id"]
+    assert body["failed"][0]["code"] == 4009
+    assert body["failed"][0]["current_version"] == stale["version"] + 1
+
+    detail_a = unwrap(await client.get(f"{items_url(ws['id'])}/{a['id']}", headers=user["headers"]))
+    assert detail_a["status"] == "done"
+    assert detail_a["completed_at"] is not None
+
+
+async def test_batch_status_reports_illegal_transition(client: AsyncClient) -> None:
+    user = await login(client)
+    ws = await create_workspace(client, user, "个人")
+    inbox = await _new_item(client, user, ws["id"], title="还在收件箱")
+
+    body = unwrap(
+        await client.post(
+            f"{items_url(ws['id'])}/batch-status",
+            json={"status": "done", "items": [{"id": inbox["id"], "version": inbox["version"]}]},
+            headers=user["headers"],
+        )
+    )
+    assert body["updated"] == []
+    assert body["failed"][0]["code"] == 5002
+    assert "todo" in body["failed"][0]["allowed"]
+
+
+async def test_board_groups_by_status_and_hides_others(client: AsyncClient) -> None:
+    user = await login(client)
+    ws = await create_workspace(client, user, "个人")
+    await _new_item(client, user, ws["id"], title="待办1", status="todo")
+    await _new_item(client, user, ws["id"], title="在做1", status="doing")
+    await _new_item(client, user, ws["id"], title="卡住1", status="blocked")
+    await _new_item(client, user, ws["id"], title="收件箱的", status="inbox")
+
+    board = unwrap(await client.get(f"{items_url(ws['id'])}/board", headers=user["headers"]))
+    columns = board["columns"]
+    assert board["order"] == ["todo", "doing", "blocked", "done"]
+    assert [i["title"] for i in columns["todo"]] == ["待办1"]
+    assert [i["title"] for i in columns["doing"]] == ["在做1"]
+    assert [i["title"] for i in columns["blocked"]] == ["卡住1"]
+    assert columns["done"] == []
+    # 收件箱不属于看板任何一列
+    all_titles = [i["title"] for col in columns.values() for i in col]
+    assert "收件箱的" not in all_titles
+
+    # 别人的工作区看板为空
+    other_user = await login(client)
+    other_ws = await create_workspace(client, other_user, "别人")
+    empty = unwrap(
+        await client.get(f"{items_url(other_ws['id'])}/board", headers=other_user["headers"])
+    )
+    assert all(len(col) == 0 for col in empty["columns"].values())