feat: 添加文件上传进度和速度显示

- 新增 api.postFormDataWithProgress 方法支持上传进度回调
- 版本创建和编辑页面显示上传进度条和实时速度
- 按钮显示上传百分比
- 添加国际化翻译

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

frontend/src/plugins/i18n/en.json

@@ -1535,6 +1535,7 @@
         "zipOnly": "Only ZIP format files are supported",
         "selectZipFirst": "Please select a ZIP file first",
         "uploadSuccess": "File uploaded successfully",
+        "uploading": "Uploading...",
         "uploadFailed": "Upload failed",
         "selectAppRequired": "Please select an application",
         "versionRequired": "Please enter version number",

frontend/src/plugins/i18n/zh.json

@@ -1513,6 +1513,7 @@
         "zipOnly": "只支持ZIP格式文件",
         "selectZipFirst": "请先选择ZIP文件",
         "uploadSuccess": "文件上传成功",
+        "uploading": "正在上传...",
         "uploadFailed": "上传失败",
         "selectAppRequired": "请选择应用",
         "versionRequired": "请输入版本号",