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/playground/apps/_common/components/adapters-panel.ts

@@ -1,9 +1,9 @@
 /* eslint-disable @typescript-eslint/no-restricted-imports */
 import '@shoelace-style/shoelace/dist/components/tab-panel/tab-panel.js';
 
-import { defaultImageProxyMiddleware } from '@blocksuite/affine/blocks/image';
 import { WithDisposable } from '@blocksuite/affine/global/lit';
 import {
+  defaultImageProxyMiddleware,
   docLinkBaseURLMiddlewareBuilder,
   embedSyncedDocMiddleware,
   type HtmlAdapter,

blocksuite/playground/apps/_common/components/starter-debug-menu.ts

@@ -16,7 +16,6 @@ import '@shoelace-style/shoelace/dist/themes/light.css';
 import '@shoelace-style/shoelace/dist/themes/dark.css';
 import './left-side-panel.js';
 
-import { defaultImageProxyMiddleware } from '@blocksuite/affine/blocks/image';
 import { ExportManager } from '@blocksuite/affine/blocks/surface';
 import { toast } from '@blocksuite/affine/components/toast';
 import { StoreExtensionManagerIdentifier } from '@blocksuite/affine/ext-loader';
@@ -27,6 +26,7 @@ import {
 import type { SerializedXYWH } from '@blocksuite/affine/global/gfx';
 import { ColorScheme, type DocMode } from '@blocksuite/affine/model';
 import {
+  defaultImageProxyMiddleware,
   docLinkBaseURLMiddleware,
   HtmlAdapterFactoryIdentifier,
   MarkdownAdapterFactoryIdentifier,