完善借款、编号、付款与预算并发及验收（09-06-release-gate-integrity）

汇总已落盘的借款本金与还款、兼容历史编号的周期化编号、付款责任与回单核验、报销进度和排序、PWA/采购事务、错误原因与日期校验及ERP退役。
统一共享预算池锁序和锁后判断，恢复差旅原预算选择，补原因码固定夹具及反向完整性检查。
纳入配套迁移、测试、受管QA、分层验收合同、规约及任务记录；原始证据留在ignored artifacts。

关联任务：09-17-company-loan-principal-repayment、09-17-erp-exclusive-retirement、09-18-reimbursement-periodic-numbering、09-08-reimbursement-payment-closeout、09-18-local-concurrency-product-fixes、09-19-budget-pool-concurrency、09-05-error-explainability-payment-readiness。
预算补审由Claude定向验证2文件928项通过，原4446/28及r6结果仍仅对应各自历史输入；本轮未重跑测试。
完整新候选门禁、R1真实入口接入与12项公网义务仍开放。生产编号未启用、差旅仍冻结；不推送、不部署，不宣称发布资格。

server/tests/unit/routes/reimbursements.create.test.js

@@ -1,3 +1,4 @@
+const { enableNumbering } = require("../helpers/activeNumbering");
 const Fastify = require("fastify");
 
 const { AppError } = require("../../../src/utils/AppError");
@@ -242,6 +243,8 @@ async function buildApp(options = {}) {
           return found ? cloneTravelRequest(found) : null;
         }),
       },
+      businessNumberPolicy: { findUnique: vi.fn(async () => null) },
+      $executeRaw: vi.fn(async () => 0),
       documentSequence: {
         findUnique: vi.fn(async () => null),
         upsert: vi.fn(async ({ create, update }) => {
@@ -268,7 +271,7 @@ async function buildApp(options = {}) {
         create: vi.fn(async ({ data, select }) => {
           const record = {
             id: `reimbursement-${stateRef.reimbursements.length + 1}`,
-            form_number: null,
+            form_number: data.form_number,
             submitter_id: data.submitter_id,
             owner_id: data.owner_id,
             department_id: data.department_id,
@@ -348,6 +351,7 @@ async function buildApp(options = {}) {
       sequenceNumber: state.sequenceNumber,
     };
     const tx = buildPrismaLike(txState);
+    if (options.activeNumbering) enableNumbering(tx);
     const result = await callback(tx);
     state.reimbursements = txState.reimbursements;
     state.reimbursementItems = txState.reimbursementItems;
@@ -409,6 +413,16 @@ describe("reimbursement create enhancements", () => {
     listActiveDelegationPrincipalsMock.mockResolvedValue([]);
   });
 
+  it("persists a monthly number on new drafts only when policy is active", async () => {
+    const { app, state } = await buildApp({ activeNumbering: true });
+    try {
+      const response = await app.inject({ method: "POST", url: "/api/reimbursements", payload: { description: "合成月号" } });
+      expect(response.statusCode).toBe(200);
+      expect(state.reimbursements[0].form_number).toMatch(/^BX-\d{6}-0001$/);
+      expect(state.sequenceNumber ?? 0).toBe(0);
+    } finally { await app.close(); }
+  });
+
   it("keeps blank reimbursement creation working", async () => {
     const { app, state } = await buildApp();