refactor(api): 统一将/story/路径修改为/api/story/

修改服务端API路径前缀以保持一致性，涉及前端请求、nginx配置和代理设置

public/sw.js

@@ -94,7 +94,7 @@ self.addEventListener('fetch', (event) => {
  */
 function isApiRequest(url) {
   return url.pathname.startsWith('/api/') || 
-         url.pathname.startsWith('/story/') ||
+         url.pathname.startsWith('/api/story/') ||
          url.pathname.startsWith('/file/') ||
          url.pathname.startsWith('/user/');
 }