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。

client/src/api/travelPayments.ts

@@ -87,33 +87,6 @@ export type TravelPaymentBoundInvoice = {
   linkedTravelOrderId: string | null;
 };
 
-export type TravelPaymentErpStage = {
-  binding: {
-    id: string;
-    provider: string;
-    entityType: string;
-    localId: string;
-    externalId: string | null;
-    externalCode: string | null;
-    lastSyncedAt: string | null;
-  } | null;
-  outbox: {
-    id: string;
-    eventType: string;
-    status: string;
-    lastError: string | null;
-    processedAt: string | null;
-    updatedAt: string | null;
-  } | null;
-  exportState: {
-    externalId: string | null;
-    lastOutboxId: string | null;
-    lastOutboxStatus: string | null;
-    lastError: string | null;
-    exportedAt: string | null;
-  };
-};
-
 export type TravelPaymentOrder = {
   id: string;
   externalOrderNo: string;
@@ -128,7 +101,6 @@ export type TravelPaymentOrder = {
   paidBy: string | null;
   boundInvoices: TravelPaymentBoundInvoice[];
   matchedTransactions: TravelPaymentTransaction[];
-  erpStage: TravelPaymentErpStage;
   actions: {
     canMarkPaid: boolean;
     canBindInvoice: boolean;
@@ -242,12 +214,6 @@ export async function markTravelOrderPaid(
     paymentVoucherNo: string | null;
     paymentDate: string | null;
     paymentChannel: TravelPaymentChannel | null;
-    erpJournal: {
-      eventType: string;
-      outboxId: string | null;
-      dedupeKey: string;
-      enqueued: boolean;
-    };
   }>(`/api/travel-orders/${travelOrderId}/mark-paid`, {
     method: "POST",
     body: JSON.stringify(payload),