fixd: 修改dev.js脚本

dev.js

@@ -16,7 +16,7 @@ if (!existsSync(backendEnv) && existsSync(backendEnvExample)) {
   console.log('Please edit backend/.env and add your DASHSCOPE_API_KEY and DASHSCOPE_APP_ID');
 }
 
-const BACKEND_URL = 'http://localhost:3000';
+const BACKEND_URL = 'http://localhost:3101';
 const HEALTH_ENDPOINT = `${BACKEND_URL}/api/health`;
 
 function waitForBackend(maxRetries = 30, interval = 1000) {