feat: 支持工作流文件节点多格式文档导出

- 补齐 md/html/pdf/docx 导出与统一渲染服务

- 收口文件生成节点配置与格式校验

- 修复 PDF 中文字体与 Markdown 渲染链路

easyflow-ui-admin/app/src/locales/langs/en-US/aiWorkflow.json

@@ -42,6 +42,16 @@
   "fileGeneration": "FileGeneration",
   "fileSettings": "FileSettings",
   "fileDownloadURL": "FileDownloadURL",
+  "targetFormat": "TargetFormat",
+  "fileName": "FileName",
+  "documents": "Documents",
+  "count": "Count",
+  "fileNamePlaceholder": "For example: meeting-notes",
+  "templateStyle": "TemplateStyle",
+  "defaultTemplateStyle": "Default",
+  "plain_text": "Plain Text",
+  "markdown": "Markdown",
+  "html": "HTML",
   "pluginSelect": "PluginSelect",
   "saveData": "SaveData",
   "saveDataset": "Write Data",
@@ -105,6 +115,9 @@
     "fileGeneration": "Generate Word, PDF, HTML, etc. files for users to download",
     "fileType": "Please select the type of file to generate",
     "fileDownloadURL": "Generated file URL",
+    "targetFormat": "Choose the final document format to export",
+    "fileName": "Optional. The system will sanitize invalid characters and enforce the target extension",
+    "templateStyle": "Only the default style is available in the first version. Unknown values fall back automatically",
     "plugin": "Select a predefined plugin",
     "saveData": "Save data to data hub",
     "saveDataset": "Write data into a managed table",