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/app/repositories/param_repository.py

@@ -10,6 +10,7 @@ from sqlalchemy import Select, delete, func, select
 from sqlalchemy.orm import Session
 
 from app.models import ParamChangeBatch, ParamDefinition, ParamValue
+from app.schemas.param import ParamBatchQuery, ParamHistoryQuery
 
 # ==================== 读取 ====================
 
@@ -97,27 +98,27 @@ def list_definitions_by_codes(
 
 
 def list_history(
-    session: Session,
-    param_id: int,
-    *,
-    offset: int,
-    limit: int,
-    dimension_value: str | None = None,
+    session: Session, param_id: int, query: ParamHistoryQuery
 ) -> list[tuple[ParamValue, ParamChangeBatch]]:
-    """单参数的版本历史（含批次信息），最新在前。"""
-    stmt = _history_stmt(session, param_id, dimension_value=dimension_value)
-    return [(value, batch) for value, batch in session.execute(stmt.offset(offset).limit(limit))]
+    """单参数的版本历史（含批次信息），最新在前。
+
+    ``param_id`` 是「查哪个参数」的主锚点（由路径参数 param_code 解析而来），
+    不属于列表筛选项，故仍以位置参数传入；筛选与分页走 ``query``。
+    """
+    stmt = _history_stmt(param_id, query)
+    return [
+        (value, batch)
+        for value, batch in session.execute(stmt.offset(query.offset).limit(query.page_size))
+    ]
 
 
-def count_history(session: Session, param_id: int, *, dimension_value: str | None = None) -> int:
+def count_history(session: Session, param_id: int, query: ParamHistoryQuery) -> int:
     """统计单参数的历史条目数。"""
-    stmt = select(func.count()).select_from(
-        _history_stmt(session, param_id, dimension_value=dimension_value).subquery()
-    )
+    stmt = select(func.count()).select_from(_history_stmt(param_id, query).subquery())
     return int(session.execute(stmt).scalar_one())
 
 
-def _history_stmt(session: Session, param_id: int, *, dimension_value: str | None) -> Select:
+def _history_stmt(param_id: int, query: ParamHistoryQuery) -> Select:
     """历史查询基语句：条目 join 批次（版本号/操作人），最新在前。"""
     stmt = (
         select(ParamValue, ParamChangeBatch)
@@ -125,8 +126,8 @@ def _history_stmt(session: Session, param_id: int, *, dimension_value: str | Non
         .where(ParamValue.param_id == param_id)
         .order_by(ParamValue.effective_date.desc(), ParamValue.id.desc())
     )
-    if dimension_value is not None:
-        stmt = stmt.where(ParamValue.dimension_value == dimension_value)
+    if query.dimension_value is not None:
+        stmt = stmt.where(ParamValue.dimension_value == query.dimension_value)
     return stmt
 
 
@@ -150,41 +151,30 @@ def get_batch_by_id(
     return session.get(ParamChangeBatch, batch_id)
 
 
-def list_batches(
-    session: Session,
-    *,
-    offset: int,
-    limit: int,
-    start_date: date | None = None,
-    end_date: date | None = None,
-) -> list[ParamChangeBatch]:
+def list_batches(session: Session, query: ParamBatchQuery) -> list[ParamChangeBatch]:
     """分页查询变更批次（按创建时间倒序）。"""
-    stmt = _batch_filters(select(ParamChangeBatch), start_date=start_date, end_date=end_date)
+    stmt = _batch_filters(select(ParamChangeBatch), query)
     return list(
         session.execute(
             stmt.order_by(ParamChangeBatch.create_time.desc(), ParamChangeBatch.id.desc())
-            .offset(offset)
-            .limit(limit)
+            .offset(query.offset)
+            .limit(query.page_size)
         ).scalars()
     )
 
 
-def count_batches(
-    session: Session, *, start_date: date | None = None, end_date: date | None = None
-) -> int:
+def count_batches(session: Session, query: ParamBatchQuery) -> int:
     """统计符合条件的批次总数。"""
-    stmt = _batch_filters(
-        select(func.count(ParamChangeBatch.id)), start_date=start_date, end_date=end_date
-    )
+    stmt = _batch_filters(select(func.count(ParamChangeBatch.id)), query)
     return int(session.execute(stmt).scalar_one())
 
 
-def _batch_filters(stmt: Select, *, start_date: date | None, end_date: date | None) -> Select:
+def _batch_filters(stmt: Select, query: ParamBatchQuery) -> Select:
     """批次筛选（生效日期区间，含边界）。列表与计数共用。"""
-    if start_date is not None:
-        stmt = stmt.where(ParamChangeBatch.effective_date >= start_date)
-    if end_date is not None:
-        stmt = stmt.where(ParamChangeBatch.effective_date <= end_date)
+    if query.start_date is not None:
+        stmt = stmt.where(ParamChangeBatch.effective_date >= query.start_date)
+    if query.end_date is not None:
+        stmt = stmt.where(ParamChangeBatch.effective_date <= query.end_date)
     return stmt