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/services/param_service.py

@@ -6,7 +6,7 @@ ParamSnapshot 是 M3 核算与计算预览共用的输入契约：按业务日
 """
 
 import logging
-from collections.abc import Iterable
+from collections.abc import Callable, Iterable
 from dataclasses import dataclass
 from datetime import date
 from decimal import Decimal
@@ -379,16 +379,8 @@ def get_history(
     definition = param_repository.get_definition_by_code(session, param_code)
     if definition is None:
         raise NotFoundError("参数不存在")
-    rows = param_repository.list_history(
-        session,
-        definition.id,
-        offset=query.offset,
-        limit=query.page_size,
-        dimension_value=query.dimension_value,
-    )
-    total = param_repository.count_history(
-        session, definition.id, dimension_value=query.dimension_value
-    )
+    rows = param_repository.list_history(session, definition.id, query)
+    total = param_repository.count_history(session, definition.id, query)
     return PageResult[ParamHistoryOut](
         records=[
             ParamHistoryOut(
@@ -410,16 +402,8 @@ def get_history(
 
 def list_batches(session: Session, query: ParamBatchQuery) -> PageResult[ParamBatchOut]:
     """变更批次分页（按创建时间倒序）。"""
-    batches = param_repository.list_batches(
-        session,
-        offset=query.offset,
-        limit=query.page_size,
-        start_date=query.start_date,
-        end_date=query.end_date,
-    )
-    total = param_repository.count_batches(
-        session, start_date=query.start_date, end_date=query.end_date
-    )
+    batches = param_repository.list_batches(session, query)
+    total = param_repository.count_batches(session, query)
     return PageResult[ParamBatchOut](
         records=[
             ParamBatchOut(
@@ -509,19 +493,66 @@ def compare(session: Session, *, from_date: date, to_date: date) -> list[ParamDi
     return out
 
 
-def _preview_rate(
-    session: Session,
-    payload: ParamPreviewIn,
-    snapshot: ParamSnapshot,
-    days: int,
-    take,
-) -> tuple[Fraction, str, Decimal | None]:
+@dataclass(frozen=True, slots=True)
+class _PreviewContext:
+    """预览上下文（会话、入参、参数取值闭包）。
+
+    ``take`` 闭包同时负责取数与记录「用了哪些参数」——**调用顺序即
+    ``params_used`` 的展示顺序**，拆分时不得调换各段的先后。
+    """
+
+    session: Session
+    payload: ParamPreviewIn
+    take: Callable[[str], Fraction]
+
+
+@dataclass(frozen=True, slots=True)
+class _PreviewRateDecision:
+    """计提比例判定（回款天数、纯比例、人读说明、绩效基数覆盖值）。"""
+
+    days: int
+    rate: Fraction
+    rate_text: str
+    base_override: Decimal | None
+
+
+@dataclass(frozen=True, slots=True)
+class _PreviewEarning:
+    """折算与绩效（毛利润率、折算额、绩效额）。"""
+
+    profit_rate: Fraction
+    converted: Decimal
+    performance: Decimal
+
+
+@dataclass(frozen=True, slots=True)
+class _PreviewBarter:
+    """以物抵顶（是否适用、折算后绩效、计发基数）。"""
+
+    applied: bool
+    after_barter: Decimal | None
+    base_amount: Decimal
+
+
+@dataclass(frozen=True, slots=True)
+class _PreviewPayment:
+    """支付环节（起付判定、R 权重、权重、应付金额）。"""
+
+    start_ok: bool
+    weight_r: int
+    weight: Fraction
+    payable: Decimal
+
+
+def _preview_rate(ctx: _PreviewContext, days: int) -> tuple[Fraction, str, Decimal | None]:
     """按岗位模板分派计提比例，返回（纯比例, 人读说明, 绩效基数覆盖值）。
 
     基数覆盖值非 None 表示该模板的绩效基数不是折算毛利润额（如信息员按
     「本人销售额」计提），预览层直接采用并跳过折算与阈值。
     聚合模板（营销经理 12.5%+5%）依赖月度团队数据，不支持单笔预览。
     """
+    payload = ctx.payload
+    take = ctx.take
     if payload.customer_type == "enterprise":
         # 存储口径为 ‰ 数（如 "3"），除以 1000 转纯比例 —— performance_amount
         # 按纯比例相乘，漏换算会把绩效金额放大 1000 倍（与业务员分支同防线）
@@ -531,7 +562,7 @@ def _preview_rate(
     role_code = payload.business_role
     template = "TPL_SALESPERSON_DECAY"
     if role_code:
-        role = business_role_repository.get_by_code(session, role_code)
+        role = business_role_repository.get_by_code(ctx.session, role_code)
         if role is None:
             raise BadRequestError(f"岗位 {role_code!r} 不存在")
         template = role.calc_template
@@ -561,12 +592,73 @@ def _preview_rate(
     raise BadRequestError(f"公式模板 {template} 暂不支持预览")
 
 
+def _preview_rate_decision(ctx: _PreviewContext) -> _PreviewRateDecision:
+    """产品类别校验 + 回款天数 + 计提比例判定。"""
+    payload = ctx.payload
+    if payload.product_category and payload.product_category not in PRODUCT_CATEGORIES:
+        raise BadRequestError(
+            f"产品类别 {payload.product_category!r} 不存在，可选：municipal_water / rail_transit"
+        )
+    days = formula.payment_days(payload.ship_date, payload.receipt_date)
+    rate, rate_text, base_override = _preview_rate(ctx, days)
+    return _PreviewRateDecision(
+        days=days, rate=rate, rate_text=rate_text, base_override=base_override
+    )
+
+
+def _preview_earning(ctx: _PreviewContext, decision: _PreviewRateDecision) -> _PreviewEarning:
+    """毛利润率 → 折算额（阈值）→ 绩效额（比例）。"""
+    payload = ctx.payload
+    revenue = Decimal(payload.revenue)
+    profit = Decimal(payload.profit)
+    profit_rate = formula.profit_rate(profit, revenue)
+    if decision.base_override is not None:
+        # 基数覆盖（信息员按本人销售额计提）：不走折算与阈值
+        converted = decision.base_override
+    else:
+        threshold = ctx.take("product.threshold")
+        converted = formula.converted_profit(revenue, profit_rate, threshold)
+    performance = formula.performance_amount(converted, decision.rate)
+    return _PreviewEarning(profit_rate=profit_rate, converted=converted, performance=performance)
+
+
+def _preview_barter(ctx: _PreviewContext, performance: Decimal) -> _PreviewBarter:
+    """以物抵顶折算（按应发绩效的固定比例折算，比例来自参数）。"""
+    applied = ctx.payload.barter
+    after_barter: Decimal | None = None
+    if applied:
+        discount = ctx.take("barter.discount")
+        after_barter = formula.apply_barter(performance, discount)
+    base_amount = after_barter if applied else performance
+    return _PreviewBarter(applied=applied, after_barter=after_barter, base_amount=base_amount)
+
+
+def _preview_payment(
+    ctx: _PreviewContext, received: Decimal, revenue: Decimal, base_amount: Decimal
+) -> _PreviewPayment:
+    """起付比例判定 + R 权重 + 应付金额。"""
+    start_ratio = ctx.take("payment.start.ratio")
+    start_ok = formula.start_payment_ok(received, revenue, start_ratio)
+    # R 钳制已提取为纯函数 clamp_weight_r（④ 核算与预览共用同一实现）
+    weight_r = formula.clamp_weight_r(received, revenue)
+    weight = formula.payment_weight(weight_r)
+    payable = to_decimal(Fraction(base_amount) * weight)
+    return _PreviewPayment(start_ok=start_ok, weight_r=weight_r, weight=weight, payable=payable)
+
+
+def _preview_probation_note(ctx: _PreviewContext) -> str | None:
+    """试用期说明（绩效照算不发放，年累计超阈值的部分年底一次性结算）。"""
+    if not ctx.payload.probation:
+        return None
+    annual = ctx.take("probation.annual.threshold")
+    return f"试用期绩效照算不发放；年累计超 {to_decimal(annual)} 元部分年底一次性结算"
+
+
 def preview(session: Session, payload: ParamPreviewIn) -> ParamPreviewOut:
     """计算预览：入参（发货/回款/金额/岗位）→ 公式纯函数 → 出参（含所用参数）。"""
     # 参数按回款到账日取值（对照表 #11）
     snapshot = resolve_snapshot(session, payload.receipt_date)
     revenue = Decimal(payload.revenue)
-    profit = Decimal(payload.profit)
     received = Decimal(payload.received_amount)
     used: list[ParamUsedOut] = []
 
@@ -589,55 +681,29 @@ def preview(session: Session, payload: ParamPreviewIn) -> ParamPreviewOut:
         )
         return parse_fraction(raw)
 
-    if payload.product_category and payload.product_category not in PRODUCT_CATEGORIES:
-        raise BadRequestError(
-            f"产品类别 {payload.product_category!r} 不存在，可选：municipal_water / rail_transit"
-        )
-
-    days = formula.payment_days(payload.ship_date, payload.receipt_date)
-    rate, rate_text, base_override = _preview_rate(session, payload, snapshot, days, take)
-
-    profit_rate = formula.profit_rate(profit, revenue)
-    if base_override is not None:
-        # 基数覆盖（信息员按本人销售额计提）：不走折算与阈值
-        converted = base_override
-    else:
-        threshold = take("product.threshold")
-        converted = formula.converted_profit(revenue, profit_rate, threshold)
-    performance = formula.performance_amount(converted, rate)
-
-    barter_applied = payload.barter
-    after_barter: Decimal | None = None
-    if barter_applied:
-        discount = take("barter.discount")
-        after_barter = formula.apply_barter(performance, discount)
-
-    start_ratio = take("payment.start.ratio")
-    start_ok = formula.start_payment_ok(received, revenue, start_ratio)
-    # R 钳制已提取为纯函数 clamp_weight_r（④ 核算与预览共用同一实现）
-    weight_r = formula.clamp_weight_r(received, revenue)
-    weight = formula.payment_weight(weight_r)
-    base_amount = after_barter if barter_applied else performance
-    payable = to_decimal(Fraction(base_amount) * weight)
-
-    probation_note: str | None = None
-    if payload.probation:
-        annual = take("probation.annual.threshold")
-        probation_note = f"试用期绩效照算不发放；年累计超 {to_decimal(annual)} 元部分年底一次性结算"
+    ctx = _PreviewContext(session=session, payload=payload, take=take)
+    # 各段顺序固定 —— take 的调用顺序即 params_used 的展示顺序
+    decision = _preview_rate_decision(ctx)
+    earning = _preview_earning(ctx, decision)
+    barter = _preview_barter(ctx, earning.performance)
+    payment = _preview_payment(ctx, received, revenue, barter.base_amount)
+    probation_note = _preview_probation_note(ctx)
 
     return ParamPreviewOut(
-        payment_days=days,
-        rate=str(rate),
-        rate_text=rate_text,
-        profit_rate=str(profit_rate),
-        converted_profit=str(converted),
-        performance_amount=str(performance),
-        barter_applied=barter_applied,
-        performance_after_barter=str(after_barter) if after_barter is not None else None,
-        start_payment_ok=start_ok,
-        payment_weight_r=weight_r,
-        payment_weight=str(weight),
-        payable_amount=str(payable),
+        payment_days=decision.days,
+        rate=str(decision.rate),
+        rate_text=decision.rate_text,
+        profit_rate=str(earning.profit_rate),
+        converted_profit=str(earning.converted),
+        performance_amount=str(earning.performance),
+        barter_applied=barter.applied,
+        performance_after_barter=(
+            str(barter.after_barter) if barter.after_barter is not None else None
+        ),
+        start_payment_ok=payment.start_ok,
+        payment_weight_r=payment.weight_r,
+        payment_weight=str(payment.weight),
+        payable_amount=str(payment.payable),
         probation_note=probation_note,
         params_used=used,
     )