feat: 添加图标映射功能

- 新增 iconMap.js 文件，集中管理应用中的图标资源。
- 提供 getIconUrl 函数以便根据名称获取对应图标的 URL，提升代码可维护性。

buyer/src/assets/iconfont/iconMap.js

@@ -0,0 +1,29 @@
+import back from "./back.png";
+import carts from "./carts.png";
+import collage from "./collage.png";
+import feedback from "./feedback.png";
+import notice from "./notice.png";
+import notification from "./notification.png";
+import shop from "./shop.png";
+import story from "./story.png";
+import support from "./support.png";
+import user from "./user.png";
+
+const iconMap = {
+  back,
+  carts,
+  collage,
+  feedback,
+  notice,
+  notification,
+  shop,
+  story,
+  support,
+  user,
+};
+
+export function getIconUrl(name) {
+  return iconMap[name] || "";
+}
+
+export default iconMap;