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-dialog-slots.js

@@ -0,0 +1,52 @@
+#!/usr/bin/env node
+const fs = require("fs");
+const path = require("path");
+
+const ROOT = path.join(__dirname, "..");
+
+function walkDir(dir, files = []) {
+  for (const entry of fs.readdirSync(dir, { withFileTypes: true })) {
+    const full = path.join(dir, entry.name);
+    if (entry.isDirectory()) walkDir(full, files);
+    else if (entry.name.endsWith(".vue")) files.push(full);
+  }
+  return files;
+}
+
+function fix(content) {
+  let c = content;
+
+  c = c.replace(/<p #header>/g, "<template #header><p>");
+  c = c.replace(
+    /(<template #header><p>[\s\S]*?<\/p>)(\s*<div)/g,
+    "$1</template>$2"
+  );
+
+  c = c.replace(
+    /<template #footer><div([^>]*)>([\s\S]*?)<\/div><\/template><\/el-dialog>/g,
+    "<template #footer><div$1>$2</div></template>\n    </el-dialog>"
+  );
+
+  c = c.replace(
+    /<template #default\s*>([\s\S]*?)<\/template\s*>/g,
+    (match, inner) => {
+      if (match.includes("el-alert")) {
+        return `<template #title>${inner}</template>`;
+      }
+      return match;
+    }
+  );
+
+  return c;
+}
+
+let count = 0;
+for (const file of walkDir(path.join(ROOT, "src"))) {
+  const original = fs.readFileSync(file, "utf8");
+  const fixed = fix(original);
+  if (fixed !== original) {
+    fs.writeFileSync(file, fixed);
+    count++;
+  }
+}
+console.log(`Fixed dialog slots in ${count} files`);