refactor(util.cache): 优化定时清理过期缓存的定时器行为

新增定时器变量保存intervalId，并调用unref方法避免阻塞进程退出

packages/core/basic/src/utils/util.cache.ts

@@ -11,9 +11,10 @@ export class LocalCache<V = any> {
   cache: Map<string, { value: V; expiresAt: number }>;
   constructor(opts: { clearInterval?: number } = {}) {
     this.cache = new Map();
-    setInterval(() => {
+    const intervalId = setInterval(() => {
       this.clearExpires();
     }, opts.clearInterval ?? 5 * 60 * 1000);
+    intervalId.unref?.();
   }
 
   get(key: string): V | undefined {