refactor(editor): cleanup dead code (#12281)

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

- **Refactor**
  - Streamlined and consolidated block and inline extension exports by removing multiple block-spec and inline extension arrays from public APIs.
  - Reduced exported constants, types, and utility functions related to various block and embed features.
  - Simplified the codebase by removing deprecated type guards, adapter extensions, and redundant extension groupings.
- **Chores**
  - Cleaned up internal APIs by deleting unused exports, imports, and outdated code, enhancing maintainability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/blocks/surface-ref/src/index.ts

@@ -1,4 +1,3 @@
 export * from './commands.js';
 export * from './surface-ref-block.js';
 export * from './surface-ref-block-edgeless.js';
-export * from './surface-ref-spec.js';

blocksuite/affine/blocks/surface-ref/src/surface-ref-spec.ts

@@ -1,30 +0,0 @@
-import { SurfaceRefBlockSchema } from '@blocksuite/affine-model';
-import { ToolbarModuleExtension } from '@blocksuite/affine-shared/services';
-import {
-  BlockFlavourIdentifier,
-  BlockViewExtension,
-  FlavourExtension,
-} from '@blocksuite/std';
-import type { ExtensionType } from '@blocksuite/store';
-import { literal } from 'lit/static-html.js';
-
-import { SurfaceRefSlashMenuConfigExtension } from './configs/slash-menu';
-import { surfaceRefToolbarModuleConfig } from './configs/toolbar';
-
-const flavour = SurfaceRefBlockSchema.model.flavour;
-
-export const PageSurfaceRefBlockSpec: ExtensionType[] = [
-  FlavourExtension(flavour),
-  BlockViewExtension(flavour, literal`affine-surface-ref`),
-  ToolbarModuleExtension({
-    id: BlockFlavourIdentifier(flavour),
-    config: surfaceRefToolbarModuleConfig,
-  }),
-  SurfaceRefSlashMenuConfigExtension,
-];
-
-export const EdgelessSurfaceRefBlockSpec: ExtensionType[] = [
-  FlavourExtension(flavour),
-  BlockViewExtension(flavour, literal`affine-edgeless-surface-ref`),
-  SurfaceRefSlashMenuConfigExtension,
-];