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/scripts/fix-el-icon-click.js

@@ -0,0 +1,28 @@
+#!/usr/bin/env node
+const fs = require("fs");
+const path = require("path");
+
+const ROOT = path.join(__dirname, "..", "src");
+
+function walk(dir, files = []) {
+  for (const e of fs.readdirSync(dir, { withFileTypes: true })) {
+    const f = path.join(dir, e.name);
+    if (e.isDirectory()) walk(f, files);
+    else if (e.name.endsWith(".vue")) files.push(f);
+  }
+  return files;
+}
+
+let n = 0;
+for (const file of walk(ROOT)) {
+  let c = fs.readFileSync(file, "utf8");
+  const next = c
+    .replace(/<el-icon([^>]*?):click=/g, "<el-icon$1@click=")
+    .replace(/:class="refresh"/g, 'class="refresh"')
+    .replace(/:size="20" @click="show = false" :size="20"/g, ':size="20" @click="show = false"');
+  if (next !== c) {
+    fs.writeFileSync(file, next);
+    n++;
+  }
+}
+console.log(`Fixed el-icon click in ${n} files`);