Add article export to Word, PDF, and Markdown

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

apps/admin-web/src/i18n/messages/zh-CN.ts

@@ -1025,6 +1025,21 @@ const zhCN = {
     noContent: "当前文章还没有正文内容",
     editor: {
       publish: "发布",
+      download: "下载",
+      downloadFormats: {
+        word: "Word",
+        pdf: "PDF",
+        markdown: "Markdown",
+      },
+      downloadMessages: {
+        success: "文件已开始下载",
+        failed: "导出失败，请稍后重试",
+      },
+      markdownExportConfirm: {
+        title: "下载 Markdown",
+        description: "Markdown 文件将去除正文图片，仅保留标题、文字、表格和链接等文本内容。",
+        confirm: "确认下载",
+      },
       titlePlaceholder: "请输入文章标题",
       leaveConfirm: {
         title: "当前文章还没保存",