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-runtime-compat.js

@@ -0,0 +1,55 @@
+#!/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(/<el-pagination\b/g, "<Page");
+  c = c.replace(/<\/el-pagination>/g, "</Page>");
+
+  c = c.replace(
+    /<Icon([^>]*)\s+#prepend\s*>\s*<\/Icon>/g,
+    "<template #prepend><Icon$1></Icon></template>"
+  );
+  c = c.replace(
+    /<Icon([^>]*)\s+#prepend\s*>\s*<\/Icon>/g,
+    "<template #prepend><Icon$1></Icon></template>"
+  );
+  c = c.replace(
+    /<template #prepend><Icon([^>]*)\s*\/>/g,
+    "<template #prepend><Icon$1></Icon></template>"
+  );
+
+  c = c.replace(/@keyup\.enter\.native/g, "@keyup.enter");
+  c = c.replace(/slot="append"/g, "#append");
+  c = c.replace(/(<div[^>]*)\s+#append/g, "<template #append>$1");
+
+  c = c.replace(/(<el-button[^>]*)\slong/g, '$1 style="width:100%"');
+  c = c.replace(/@on-select/g, "@select");
+  c = c.replace(/@on-click/g, "@click");
+
+  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(`Runtime compat fixes in ${count} files`);