Fix review issues: lyrics polling, validation, undici fetch, retry, timeout, throttle, payload helper

suno-server/dist/client.d.ts

@@ -1,5 +1,5 @@
 /**
- * Suno API HTTP client with rate limiting and polling helpers.
+ * Suno API HTTP client with rate limiting, proxy support, retries and polling helpers.
  *
  * Rate limit: 20 requests per 10 seconds (sunoapi.org).
  * Proxy support via SUNO_HTTP_PROXY / HTTPS_PROXY / HTTP_PROXY env vars.
@@ -28,13 +28,19 @@ export interface SunoTrack {
     createTime?: string;
     duration?: number;
 }
+export interface SunoLyricsVariant {
+    text?: string;
+    title?: string;
+    status?: string;
+    errorMessage?: string;
+}
 export interface SunoTaskData {
     taskId: string;
     parentMusicId?: string;
     param?: string;
     response?: {
         taskId?: string;
-        data?: SunoTrack[];
+        data?: SunoTrack[] | SunoLyricsVariant[];
         sunoData?: SunoTrack[];
     };
     status: string;
@@ -49,6 +55,8 @@ export declare class SunoClient {
     private readonly maxRequests;
     private readonly windowMs;
     private readonly proxyAgent?;
+    private readonly requestTimeoutMs;
+    private readonly maxRetries;
     private requestTimestamps;
     constructor(apiKey: string);
     /**