feat(approval): 审批单/节点状态机与二次分配接入（开关自动通过）

- approval_orders/approval_steps 服务层：submit_order（不 commit 不嵌套
  audit，业务写路径统一收口）+ act 节点动作 + 分页/详情
- 开关关闭=提单即两级「自动通过」留痕（action=3，operator 记系统）；
  开启=财务→领导流转，一驳全驳，驳回必填意见
- 节点准入严格按角色（status=1 仅财务、status=2 仅领导），admin 不代办；
  模块准入 require_roles 依赖工厂（admin/finance/leader，营销后勤待
  澄清 #6 后放开）
- 业务接入：创建/编辑带方案即提单（空方案不提单）；再编辑自动撤回旧
  在途单（node=0/action=4 留痕）；AP 编号冲突 create 内可重取（外层
  重试兜底）、update 直接抛出防静默丢失
- conftest 兜底清理增审批单（AP 前缀）与开关参数种子基线恢复
- 集成 11 例：自动通过/两节点流转/驳回留痕/缺意见 400/节点准入 403/
  admin 不代办/重复操作 400/撤旧建新/模块准入

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

backend/app/services/business_service.py

@@ -45,6 +45,7 @@ from app.models import (
     Shipment,
     User,
 )
+from app.models.approval import APPROVAL_TYPE_SECONDARY_ALLOCATION
 from app.models.business import (
     BUSINESS_STATUS_ACTIVE,
     BUSINESS_STATUS_DONE,
@@ -69,7 +70,7 @@ from app.schemas.business import (
     SecondaryAllocationIn,
     SecondaryAllocationOut,
 )
-from app.services import audit_service, param_service, personnel_service
+from app.services import approval_service, audit_service, param_service, personnel_service
 from app.services.audit_service import AuditRecord, RequestMeta
 from app.services.formula import converted_profit, profit_rate
 from app.services.no_generator import next_no
@@ -389,6 +390,18 @@ def create_business(
                     business.id,
                     _build_allocation_rows(session, business.id, payload.secondary_allocations),
                 )
+                # 方案非空才提单：开关关闭=自动通过留痕，开启=待财务复核。
+                # retry_on_conflict=True：AP 编号撞键可内部重取（外层编号
+                # 重试循环兜底整体重来）
+                if payload.secondary_allocations:
+                    approval_service.submit_order(
+                        session,
+                        order_type=APPROVAL_TYPE_SECONDARY_ALLOCATION,
+                        ref_id=business.id,
+                        refer_no=business.business_no,
+                        submitter=operator,
+                        retry_on_conflict=True,
+                    )
                 customer = customer_repository.get_by_id(session, business.customer_id)
                 out = _to_out((business, customer.company_name if customer else None, None, None))
                 new_id, new_no = business.id, business.business_no  # 固化：commit 后不碰 ORM
@@ -469,6 +482,17 @@ def update_business(
             business_id,
             _build_allocation_rows(session, business_id, payload.secondary_allocations),
         )
+        # 方案非空提单（自动撤回旧在途单）；retry_on_conflict=False：
+        # 本路径无外层重试，内部 rollback 会回掉业务行修改造成静默丢失
+        if payload.secondary_allocations:
+            approval_service.submit_order(
+                session,
+                order_type=APPROVAL_TYPE_SECONDARY_ALLOCATION,
+                ref_id=business_id,
+                refer_no=business.business_no,
+                submitter=operator,
+                retry_on_conflict=False,
+            )
         _recalc_totals(session, business)
         # 锁定行上已赋值，同一身份映射实例的 _to_out 即反映新值；名称字段
         # 从首查 row 取（换客户时 _ensure_customer 已给出新公司名）