fix: align api keepalive with gateway pool

api/src/main.ts

@@ -7,6 +7,7 @@ import { AppModule } from './app.module';
 import { MetricsService } from './metrics/metrics.service';
 import { OpenApiModule } from './open-api/open-api.module';
 import { configureHttpBodyParsers } from './http-body-limits';
+import { configureApiHttpServerTimeouts } from './http-server-timeouts';
 
 Object.defineProperty(BigInt.prototype, 'toJSON', {
   configurable: true,
@@ -43,7 +44,8 @@ async function bootstrap() {
   const port = Number(process.env.API_PORT ?? 3000);
   // 生产环境只允许 Nginx 访问管理 API；显式绑定回环，避免默认的全网卡监听绕过入口鉴权与限流。
   const host = process.env.API_HOST?.trim() || '127.0.0.1';
-  await app.listen(port, host);
+  const apiServer = await app.listen(port, host);
+  configureApiHttpServerTimeouts(apiServer, process.env);
 
   const metrics = app.get(MetricsService);
   const metricsHost = process.env.API_METRICS_HOST?.trim() || '127.0.0.1';