chore: 更新项目配置和依赖，优化前后端代码

src/utils/i18n.js

@@ -35,6 +35,11 @@ export const translations = {
         exportPdf: 'Export PDF',
         uploadImg: 'Upload Image',
         uploadFile: 'Upload File',
+        uploadDoc: 'Upload Document',
+        uploadDocTypeWarning: 'Only txt, docx, pptx, pdf formats are supported.',
+        uploadDocSizeWarning: 'File size cannot exceed 10MB.',
+        uploadDocInBlockWarning: 'Cannot insert document inside an existing document block. Please move cursor outside.',
+        uploadDocError: 'Document conversion failed:',
         uploadFileTypeWarning: 'Unsupported file type. Supported: doc/docx/ppt/pptx/pdf/zip, images, txt/json.',
         uploadMdTypeWarning: 'Only Markdown (.md) files and image files are supported.',
         uploadFileError: 'File upload failed.',
@@ -84,6 +89,11 @@ export const translations = {
         exportPdf: '导出 PDF',
         uploadImg: '上传图片',
         uploadFile: '上传文件',
+        uploadDoc: '上传文档',
+        uploadDocTypeWarning: '仅支持 txt、docx、pptx、pdf 格式的文档',
+        uploadDocSizeWarning: '文件大小不能超过 10MB',
+        uploadDocInBlockWarning: '无法在现有文档块内插入新文档，请将光标移到文档外部',
+        uploadDocError: '文档转换失败：',
         uploadFileTypeWarning: '不支持的文件类型。仅支持 doc/docx/ppt/pptx/pdf/zip、图片、txt/json。',
         uploadMdTypeWarning: '仅支持 Markdown（.md）和图片文件。',
         uploadFileError: '文件上传失败',