docs(media): add standalone package guide

packages/ui/docs/en-US/overview.mdx

@@ -21,4 +21,4 @@ This tutorial installs the styles, introduces component subpaths, builds a small
 
 ## UI or Blocks {#ui-or-blocks}
 
-Use UI components when the application owns the workflow. Use `@workspace/blocks` when the interface also needs a complete feature contract such as navigation, media storage, search adapters, or notification queries.
+Use UI components when the application owns the workflow. Use `@workspace/blocks` for complete application-shell features such as navigation and notifications, and focused packages such as `@workspace/media` or `@workspace/search` for domain workflows.

packages/ui/docs/zh-Hans/overview.mdx

@@ -21,4 +21,4 @@ toc:
 
 ## UI 还是 Blocks {#ui-or-blocks}
 
-当应用自己拥有业务流程时使用 UI 组件。当界面还需要导航、媒体存储、搜索适配器或通知查询等完整功能契约时，使用 `@workspace/blocks`。
+当应用自己拥有业务流程时使用 UI 组件。导航和通知等完整应用外壳功能使用 `@workspace/blocks`，媒体与搜索等领域工作流使用 `@workspace/media` 或 `@workspace/search` 等专用包。