🎨 Optimize code structure

frontend/src/common/cache/index.ts

@@ -0,0 +1,19 @@
+export type {
+  CacheItem,
+  DisposableCacheItem,
+  CacheConfig,
+  CacheStats
+} from './types';
+export { LRUCache } from './lru-cache';
+export { CacheManager, globalCacheManager } from './cache-manager';
+
+export {
+  generateCacheKey,
+  createCacheItem,
+  calculateHitRate,
+  formatCacheSize,
+  isExpired,
+  createContentHash,
+  debounce,
+  throttle
+} from './utils';