升级Vue3，iView替换ElementPlus

- 删除babel配置、更新依赖与入口初始化
- 全量替换UI组件、样式适配，新增迁移文档与标签/过滤器自动化替换脚本

buyer/src/utils/message.js

@@ -0,0 +1,71 @@
+import { ElMessage, ElMessageBox } from "element-plus";
+
+export const Message = {
+  success(content) {
+    return ElMessage.success(normalize(content));
+  },
+  error(content) {
+    return ElMessage.error(normalize(content));
+  },
+  warning(content) {
+    return ElMessage.warning(normalize(content));
+  },
+  info(content) {
+    return ElMessage.info(normalize(content));
+  },
+};
+
+export const Notice = {
+  open(options = {}) {
+    const fn = Message[options.type] || Message.info;
+    return fn(options.desc || options.title || "");
+  },
+  info(options) {
+    return Message.info(options?.desc || options?.title || "");
+  },
+  success(options) {
+    return Message.success(options?.desc || options?.title || "");
+  },
+  warning(options) {
+    return Message.warning(options?.desc || options?.title || "");
+  },
+  error(options) {
+    return Message.error(options?.desc || options?.title || "");
+  },
+};
+
+export const Modal = {
+  confirm(options = {}) {
+    const content = options.content || options.title || "确认操作？";
+    return ElMessageBox.confirm(content, options.title || "提示", {
+      confirmButtonText: options.okText || "确定",
+      cancelButtonText: options.cancelText || "取消",
+      type: options.type || "warning",
+    })
+      .then(() => {
+        if (typeof options.onOk === "function") {
+          return options.onOk();
+        }
+      })
+      .catch(() => {
+        if (typeof options.onCancel === "function") {
+          options.onCancel();
+        }
+      });
+  },
+  remove() {
+    ElMessageBox.close();
+  },
+};
+
+function normalize(content) {
+  if (typeof content === "string") return content;
+  if (content && content.content) return content.content;
+  return String(content ?? "");
+}
+
+export function setupLegacyMessage(app) {
+  app.config.globalProperties.$Message = Message;
+  app.config.globalProperties.$Modal = Modal;
+  app.config.globalProperties.$Notice = Notice;
+}