fix and update

apps/frontend/lib/api.ts

@@ -677,10 +677,12 @@ export function buildSystemSettingPayload(setting: Pick<SystemSetting, 'key' | '
 }
 
 const GATEWAY_RETRY_STATUS = new Set([502, 503, 504]);
-const GATEWAY_RETRY_ATTEMPTS = 4;
+const GATEWAY_RETRY_ATTEMPTS = 2;
 const GATEWAY_PROBE_MAX_ATTEMPTS = 48;
 const GATEWAY_PROBE_BASE_DELAY_MS = 450;
 const API_MAX_CONCURRENT = 8;
+const API_BURST_MAX_CONCURRENT = 3;
+const API_BURST_WINDOW_MS = 3000;
 const API_READY_EVENT = 'idp-api-ready';
 
 function sleep(ms: number): Promise<void> {
@@ -689,6 +691,7 @@ function sleep(ms: number): Promise<void> {
 
 let gatewayReadyResolved = false;
 let gatewayReadyPromise: Promise<void> | null = null;
+let gatewayReadyAt = 0;
 let activeApiRequests = 0;
 const apiRequestWaiters: Array<() => void> = [];
 
@@ -699,6 +702,7 @@ export function resetApiGatewayWarmup() {
 
 export function invalidateApiGatewayReady() {
   gatewayReadyResolved = false;
+  gatewayReadyAt = 0;
 }
 
 export function isApiGatewayReady() {
@@ -708,6 +712,7 @@ export function isApiGatewayReady() {
 export function markApiGatewayReady() {
   if (gatewayReadyResolved) return;
   gatewayReadyResolved = true;
+  gatewayReadyAt = Date.now();
   if (typeof window !== 'undefined') {
     window.dispatchEvent(new CustomEvent(API_READY_EVENT));
   }
@@ -724,13 +729,14 @@ export function subscribeApiReady(listener: () => void): () => void {
 }
 
 async function acquireApiSlot(): Promise<void> {
-  if (activeApiRequests < API_MAX_CONCURRENT) {
-    activeApiRequests += 1;
-    return;
+  const inBurst = gatewayReadyAt > 0 && Date.now() - gatewayReadyAt < API_BURST_WINDOW_MS;
+  const limit = inBurst ? API_BURST_MAX_CONCURRENT : API_MAX_CONCURRENT;
+
+  while (activeApiRequests >= limit) {
+    await new Promise<void>((resolve) => {
+      apiRequestWaiters.push(resolve);
+    });
   }
-  await new Promise<void>((resolve) => {
-    apiRequestWaiters.push(resolve);
-  });
   activeApiRequests += 1;
 }