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/purchase.submit-budget-precheck.test.js

@@ -1,3 +1,4 @@
+const { enableNumbering } = require("../helpers/activeNumbering");
 const Fastify = require("fastify");
 
 const { AppError } = require("../../../src/utils/AppError");
@@ -64,8 +65,9 @@ async function buildApp(options = {}) {
     cost_center_id: COST_CENTER_ID,
     supplier_id: SUPPLIER_ID,
     document_category_id: DOCUMENT_CATEGORY_ID,
-    budget_pool_id: null,
+    budget_pool_id: options.explicitPool ? options.pool.id : null,
     request_no: null,
+    numbering_version: options.numberingVersion ?? 1,
     title: "R6 采购提交热修测试",
     reason: null,
     currency_code: "CNY",
@@ -92,6 +94,8 @@ async function buildApp(options = {}) {
 
   const tx = {
     $queryRaw: vi.fn(async () => [purchaseRequest]),
+    budgetPool: { findUnique: vi.fn(async () => options.pool ?? null), update: vi.fn() },
+    budgetLedgerEntry: { findMany: vi.fn(async () => []), create: vi.fn() },
     legalEntity: {
       findUnique: vi.fn(async () => ({
         id: LEGAL_ENTITY_ID,
@@ -173,6 +177,7 @@ async function buildApp(options = {}) {
     },
   };
 
+  if (options.activeNumbering) enableNumbering(tx);
   const prisma = {
     $transaction: vi.fn(async (callback) => callback(tx)),
     auditLog: {
@@ -251,6 +256,28 @@ describe("purchase request submit budget precheck gate", () => {
     resolveRecipientsForAssigneeMock.mockResolvedValue([]);
   });
 
+  it.each([false, true].flatMap(enabled => [false, true].map(explicitPool => ({ enabled, explicitPool }))))(
+    'blocks the latest pool usage inside the submit transaction: %j', async ({ enabled, explicitPool }) => {
+      const pool = { id: 'bbbbbbbb-bbbb-4bbb-8bbb-bbbbbbbbbbbb', status: 'active', archived_at: null,
+        allocated_amount: '100.00', used_amount: '60.00' };
+      resolveApplicableBudgetPoolByContextMock.mockResolvedValue(pool);
+      resolveEntityPrecheckMock.mockResolvedValue(buildPrecheck(enabled ? { decision: 'block',
+        blockingReasons: [{ code: 'budget_exceeded' }] } : {}));
+      const { app, tx } = await buildApp({ pool, explicitPool, budgetControlMode: 'block', budgetPrecheckEnabled: enabled });
+      try {
+        const response = await app.inject({ method: 'POST', url: `/api/purchase-requests/${PURCHASE_REQUEST_ID}/submit` });
+        expect(response.statusCode).toBe(409);
+        expect(response.json().error.details.reasonCode).toBe('purchase_request.precheck_blocked');
+        expect(resolveEntityPrecheckMock).toHaveBeenCalledWith(expect.objectContaining({ prisma: tx, budgetPoolForWrite: pool }));
+        expect(resolveApplicableBudgetPoolByContextMock).toHaveBeenCalledWith(tx, expect.any(Object),
+          { forUpdate: true, additionalPoolIds: [explicitPool ? pool.id : null] });
+        expect(tx.purchaseRequestItem.aggregate.mock.invocationCallOrder[0]).toBeLessThan(resolveEntityPrecheckMock.mock.invocationCallOrder[0]);
+        expect(tx.workflowInstance.create).not.toHaveBeenCalled();
+        expect(tx.budgetLedgerEntry.create).not.toHaveBeenCalled();
+        expect(tx.budgetPool.update).not.toHaveBeenCalled();
+      } finally { await app.close(); }
+    });
+
   it("does not 500 when no budget pool exists and budget precheck is disabled", async () => {
     resolveEntityPrecheckMock.mockResolvedValue(
       buildPrecheck({
@@ -289,3 +316,14 @@ describe("purchase request submit budget precheck gate", () => {
     await app.close();
   });
 });
+
+it.each([1, 2])("submits a stored v%s purchase draft under active policy without reclassifying it", async (version) => {
+  const { app, tx } = await buildApp({ activeNumbering: true, numberingVersion: version });
+  try {
+    const response = await app.inject({ method: "POST", url: `/api/purchase-requests/${PURCHASE_REQUEST_ID}/submit` });
+    expect(response.statusCode).toBe(200);
+    const data = tx.purchaseRequest.update.mock.calls.find(([arg]) => arg.data.request_no)?.[0].data;
+    expect(data.request_no).toMatch(version === 1 ? /^CG-\d{8}-0001$/ : /^CG-\d{4}-0001$/);
+    expect(tx.businessNumberPolicy.findUnique).not.toHaveBeenCalled();
+  } finally { await app.close(); }
+});