refactor(backend): 仓储层散参数收敛为查询 DTO

仓储层的 list_*/count_* 此前以 keyword/status/offset/limit 四五个散参数
传参，调用点重复铺开、易漏传且不可扩展；按项目「参数 >4 封装 DTO」的
约定统一收敛为各模块的 Query 对象（如 RoleQuery、BusinessQuery），
服务层与测试调用同步调整，行为不变。

- repositories 层查询方法签名改为 (session, query)，分页与筛选条件
  由 Query 承载，_apply_filters 同步收口
- schemas 层补齐各模块 Query 模型（approval/business_role/report 等）
- services 层调用点同步改为传 Query
- tests 随之调整；新增用例：待办角色流转（财务通过后领导出现待办）、
  参数预览顺序稳定

验证：全量 pytest 900 passed（11:08）；单元 526 passed；ruff check 绿。

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

backend/tests/integration/test_approval_flow.py

@@ -451,7 +451,9 @@ class TestContentSnapshot:
             row.snapshot_json = None
             session.commit()
 
-        detail = client.get(f"{_APPROVALS}/{order['id']}", headers=finance["headers"]).json()["data"]
+        detail = client.get(f"{_APPROVALS}/{order['id']}", headers=finance["headers"]).json()[
+            "data"
+        ]
         assert detail["content_source"] == "live"
         assert detail["snapshot"]["captured_at"] is None
         assert detail["snapshot"]["data"]["business_no"] == data["business_no"]
@@ -474,7 +476,9 @@ class TestContentSnapshot:
             row.ref_id = 999_999_999
             session.commit()
 
-        detail = client.get(f"{_APPROVALS}/{order['id']}", headers=finance["headers"]).json()["data"]
+        detail = client.get(f"{_APPROVALS}/{order['id']}", headers=finance["headers"]).json()[
+            "data"
+        ]
         assert detail["content_source"] == "missing"
         assert detail["snapshot"] is None
 
@@ -679,9 +683,7 @@ class TestAllocationVersions:
         data = _create_with_plan(client, admin["headers"], p["id"])
 
         detail = client.get(f"{_BUSINESSES}/{data['id']}", headers=admin["headers"]).json()["data"]
-        assert [(h["version_no"], h["is_active"]) for h in detail["allocation_history"]] == [
-            (1, 1)
-        ]
+        assert [(h["version_no"], h["is_active"]) for h in detail["allocation_history"]] == [(1, 1)]
 
         payload = business_payload(
             detail["customer_id"],
@@ -691,7 +693,9 @@ class TestAllocationVersions:
         assert resp.status_code == 200, resp.text
 
         detail = client.get(f"{_BUSINESSES}/{data['id']}", headers=admin["headers"]).json()["data"]
-        history = [(h["version_no"], h["is_active"], h["ratio"]) for h in detail["allocation_history"]]
+        history = [
+            (h["version_no"], h["is_active"], h["ratio"]) for h in detail["allocation_history"]
+        ]
         assert history == [(1, 0, "50.00"), (2, 1, "80.00")]
         assert [a["ratio"] for a in detail["secondary_allocations"]] == ["80.00"]