feat: 扩展知识库文档上传限制至 100 MB

- 上传前校验单文件大小并给出本地化提示

- 同步支持格式与中英文说明

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

@@ -27,7 +27,8 @@
   "copyFail": "Copy fail",
   "upload": {
     "title": "Click or drag and drop files here to upload",
-    "description": "TXT, PDF, DOCX, MD, PPT, PPTX files are supported. Each upload allows one file only, with a maximum size of 20M per file."
+    "description": "TXT, PDF, DOCX, MD, PPTX, and XLSX files are supported, up to 100 MB each.",
+    "fileTooLarge": "Each file must not exceed 100 MB"
   },
   "uploadFileFirst": "Please upload the file first",
   "deleteModelAlert": "This operation will delete the large model. Are you sure to delete it?",