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.attachments.test.js

@@ -381,7 +381,7 @@ describe("reimbursement attachment routes", () => {
       });
 
       expect(response.statusCode).toBe(409);
-      expect(response.json().error.details).toEqual({ status: "invalid_attachment_edit_status" });
+      expect(response.json().error.details).toEqual({ status: "invalid_attachment_edit_status", reasonCode: "reimbursement.status_invalid_attachment_edit_status" });
       expect(prisma.reimbursementAttachment.create).not.toHaveBeenCalled();
     } finally {
       await app.close();
@@ -665,9 +665,9 @@ describe("reimbursement attachment routes", () => {
 
       expect(unauthenticated.statusCode).toBe(401);
       expect(missingReason.statusCode).toBe(400);
-      expect(missingReason.json().error.details).toEqual({ reason: "required" });
+      expect(missingReason.json().error.details).toEqual({ reason: "required", reasonCode: "reimbursement.reason_required" });
       expect(missingBundleReason.statusCode).toBe(400);
-      expect(missingBundleReason.json().error.details).toEqual({ reason: "required" });
+      expect(missingBundleReason.json().error.details).toEqual({ reason: "required", reasonCode: "reimbursement.reason_required" });
       expect(prisma.auditLog.create).not.toHaveBeenCalled();
     } finally {
       await app.close();