feat(AddOrEdit): support export and import a storage

[xrgzs]

Description / 描述

增加存储配置导入导出功能

Motivation and Context / 背景

方便迁移、克隆存储以及BUG反馈

Close: OpenListTeam/OpenList#1909

How Has This Been Tested? / 测试

• 导入自动删除 id、disabled、modified、status 字段，避免导入失败

• 修复了驱动选择的 Item 组件不支持响应式更改值的问题

• 让用户自行复制粘贴 textarea 里面的 JSON，避免部分浏览器不支持操作剪贴板

Checklist / 检查清单

• I have read the CONTRIBUTING document.
  我已阅读 CONTRIBUTING 文档。
• I have formatted my code with go fmt or prettier.
  我已使用 go fmt 或 prettier 格式化提交的代码。
• I have added appropriate labels to this PR (or mentioned needed labels in the description if lacking permissions).
  我已为此 PR 添加了适当的标签（如无权限或需要的标签不存在，请在描述中说明，管理员将后续处理）。
• I have requested review from relevant code authors using the "Request review" feature when applicable.
  我已在适当情况下使用"Request review"功能请求相关代码作者进行审查。
• I have updated the repository accordingly (If it’s needed).
  我已相应更新了相关仓库（若适用）。
  • OpenList-Frontend #XXXX
  • OpenList-Docs #XXXX

[Copilot]

Pull request overview

This PR adds export and import functionality for storage configurations in the AddOrEdit page, making it easier to migrate, clone storage configurations, and report bugs. The implementation includes three main changes: UI buttons with modal dialogs for import/export, support for reactive values in form components, and English translations for the new features.

Key Changes

• Added Export and Import buttons with modal dialogs that allow users to copy/paste JSON configuration
• Modified the Item component to support both direct values and reactive Accessor functions, fixing an issue where the driver selection component didn't support reactive value changes
• Import automatically strips server-managed fields (id, disabled, modified, status) to prevent import failures

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
src/pages/manage/storages/AddOrEdit.tsx	Added export/import buttons with ModalInput dialogs, restructured button layout into HStack, and implemented JSON serialization logic for storage configurations
src/pages/manage/storages/Item.tsx	Enhanced type definitions to accept both direct values and Accessor functions, added getVal helper function, and changed Switch component from defaultChecked to checked for proper reactivity
src/lang/en/storages.json	Added English translations for export, import buttons and modal titles

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