refactor: 更新存储菜单组件的弹出位置为顶部右侧，优化HTTP服务实例创建方式以增强类型安全

src/components/context-menu/storage-menu.vue

@@ -40,7 +40,7 @@
       v-if="showSubMenu && selectedLocation"
       :open="!!showSubMenu"
       :trigger="[]"
-      placement="rightTop"
+      placement="topRight"
       :get-popup-container="getSubMenuContainer"
       @open-change="handleSubMenuOpenChange"
     >

src/services/http.ts

@@ -2,11 +2,11 @@ import { message } from 'ant-design-vue';
 import axios, { type AxiosInstance, type AxiosRequestConfig } from 'axios';
 
 // 创建HTTP实例
-const http: HttpInstance = axios.create({
+const http = (axios.create({
   baseURL: import.meta.env.ENV_HTTP_BASE,
   adapter: 'fetch',
   timeout: 30_000,
-});
+}) as unknown) as HttpInstance;
 
 // 添加FormData上传方法
 http.postFormData = async <D = void>(url: string, formData: FormData, config?: AxiosRequestConfig): Promise<D | undefined> => {