feat: 完成错误原因合同与付款就绪提示（09-05-error-explainability-payment-readiness）

server/tests/unit/routes/reimbursements.expense-standards.test.js

@@ -317,7 +317,7 @@ describe("reimbursements routes expense standard integration", () => {
     const response = await app.inject({ method: "POST", url: `/api/reimbursements/${REIMBURSEMENT_ID}/submit` });
 
     expect(response.statusCode).toBe(400);
-    expect(response.json().error.details).toEqual({ items: "at_least_one_required" });
+    expect(response.json().error.details).toEqual({ items: "at_least_one_required", reasonCode: "reimbursement.items_at_least_one_required" });
     expect(tx.reimbursementForm.update).not.toHaveBeenCalled();
     await app.close();
   });
@@ -336,6 +336,7 @@ describe("reimbursements routes expense standard integration", () => {
     expect(response.json().error.details).toEqual({
       items: "positive_amount_required",
       itemIds: ["item-zero"],
+      reasonCode: "reimbursement.items_positive_amount_required",
     });
     expect(tx.workflowInstance.create).not.toHaveBeenCalled();
     await app.close();
@@ -416,7 +417,7 @@ describe("reimbursements routes expense standard integration", () => {
 
     const response = await app.inject({ method: "POST", url: `/api/reimbursements/${REIMBURSEMENT_ID}/submit` });
     expect(response.statusCode).toBe(400);
-    expect(response.json().error.details).toEqual({ invoices: "bound_invoice_required" });
+    expect(response.json().error.details).toEqual({ invoices: "bound_invoice_required", reasonCode: "reimbursement.invoices_bound_invoice_required" });
     expect(tx.workflowInstance.create).not.toHaveBeenCalled();
     await app.close();
   });