feat(M06-A): 建立MQTT连接与Broker基础

backend/tests/profit-sharing.test.mjs

@@ -7,6 +7,8 @@ import { WechatPayClient } from '../dist/payments/wechat-pay-client.js';
 
 assert.equal(loadConfig({
   NODE_ENV: 'production',
+  QIPAI_MQTT_USERNAME: 'backend-test',
+  QIPAI_MQTT_PASSWORD: 'not-a-real-secret',
   QIPAI_JWT_SECRET: 'production-profit-share-secret-long-enough',
   QIPAI_PROFIT_SHARE_MOCK_ENABLED: 'true'
 }).payment.profitShareMockEnabled, false);