chore: proxy image preview in frontend (#11957)

<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit

- **New Features**
	- Images and icons in bookmark cards are now loaded through an image proxy for improved reliability and consistency.
	- Embed blocks for GitHub, Loom, and YouTube now display banner and creator images via an image proxy service for enhanced image loading.

- **Refactor**
	- Simplified backend URL handling and proxy logic for images, resulting in more efficient processing and reduced complexity.
	- Consolidated image proxy middleware and services into a shared adapter module for streamlined imports and improved maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/root/src/clipboard/readonly-clipboard.ts

@@ -1,8 +1,8 @@
-import { defaultImageProxyMiddleware } from '@blocksuite/affine-block-image';
 import {
   AttachmentAdapter,
   ClipboardAdapter,
   copyMiddleware,
+  defaultImageProxyMiddleware,
   HtmlAdapter,
   ImageAdapter,
   MixTextAdapter,