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/invoicePool.verification.test.js

@@ -315,7 +315,7 @@ describe("invoicePool verification routes", () => {
       });
 
       expect(response.statusCode).toBe(409);
-      expect(response.json().error.details).toEqual({ verification: "too_frequent" });
+      expect(response.json().error.details).toEqual({ verification: "too_frequent", reasonCode: "invoice_verification.too_frequent" });
       expect(tx.invoiceVerificationRecord.create).not.toHaveBeenCalled();
     } finally {
       vi.useRealTimers();
@@ -433,7 +433,7 @@ describe("invoicePool verification routes", () => {
       });
 
       expect(response.statusCode).toBe(409);
-      expect(response.json().error.details).toEqual({ verification: "attempts_exceeded" });
+      expect(response.json().error.details).toEqual({ verification: "attempts_exceeded", reasonCode: "invoice_verification.attempts_exceeded" });
       expect(tx.invoiceVerificationRecord.create).not.toHaveBeenCalled();
       expect(app.boss.send).not.toHaveBeenCalled();
     } finally {