feat: add cache control

src/lib/config.ts

@@ -9,6 +9,7 @@ export interface ApiSite {
 }
 
 export interface Config {
+  cache_time?: number;
   api_site: {
     [key: string]: ApiSite;
   };
@@ -49,6 +50,11 @@ export function getConfig(): Config {
   return parsedConfig;
 }
 
+export function getCacheTime(): number {
+  const config = getConfig();
+  return config.cache_time || 300; // 默认5分钟缓存
+}
+
 export function getApiSites(): ApiSite[] {
   const config = getConfig();
   return Object.entries(config.api_site).map(([key, site]) => ({