refactor: reorganize specs and adapter extensions (#10359)

### TL;DR
Refactored `SpecProvider` singleton access pattern and reorganized adapter/extension code structure.

### What changed?
- Changed `SpecProvider.getInstance()` to `SpecProvider._` for cleaner singleton access
- Moved adapter/extension code from `_common` directory to dedicated `adapters` and `extensions` folders
- Consolidated adapter extensions into a single file
- Removed unused dependencies from package.json
- Deleted unnecessary schema files
- Extracted `MobileSpecsPatches` class into the mobile patching code
- Updated all references to use the new `SpecProvider._` accessor

### How to test?
- Verify all specs are properly registered and accessible via `SpecProvider._`
- Test adapter functionality for HTML, Markdown, Notion HTML and plain text
- Check mobile-specific features and patches work correctly
- Ensure preview functionality works in both page and edgeless modes

### Why make this change?
- Improves code organization by properly separating adapters and extensions
- Simplifies singleton access pattern
- Removes unnecessary dependencies and files
- Makes the codebase more maintainable by consolidating related functionality

blocksuite/blocks/src/__tests__/adapters/html.unit.spec.ts

@@ -1,13 +1,8 @@
-import {
-  HtmlInlineToDeltaAdapterExtensions,
-  InlineDeltaToHtmlAdapterExtensions,
-} from '@blocksuite/affine-components/rich-text';
 import { DefaultTheme, NoteDisplayMode } from '@blocksuite/affine-model';
 import {
   embedSyncedDocMiddleware,
   HtmlAdapter,
 } from '@blocksuite/affine-shared/adapters';
-import { Container } from '@blocksuite/global/di';
 import type {
   BlockSnapshot,
   DocSnapshot,
@@ -16,19 +11,11 @@ import type {
 import { AssetsManager, MemoryBlobCRUD } from '@blocksuite/store';
 import { describe, expect, test } from 'vitest';
 
-import { defaultBlockHtmlAdapterMatchers } from '../../_common/adapters/html/block-matcher.js';
 import { createJob } from '../utils/create-job.js';
+import { getProvider } from '../utils/get-provider.js';
 import { nanoidReplacement } from '../utils/nanoid-replacement.js';
 
-const container = new Container();
-[
-  ...HtmlInlineToDeltaAdapterExtensions,
-  ...defaultBlockHtmlAdapterMatchers,
-  ...InlineDeltaToHtmlAdapterExtensions,
-].forEach(ext => {
-  ext.setup(container);
-});
-const provider = container.provider();
+const provider = getProvider();
 
 describe('snapshot to html', () => {
   const template = (html: string, title?: string) => {

blocksuite/blocks/src/__tests__/adapters/markdown.unit.spec.ts

@@ -1,7 +1,3 @@
-import {
-  InlineDeltaToMarkdownAdapterExtensions,
-  MarkdownInlineToDeltaAdapterExtensions,
-} from '@blocksuite/affine-components/rich-text';
 import {
   DefaultTheme,
   NoteDisplayMode,
@@ -11,7 +7,6 @@ import {
   embedSyncedDocMiddleware,
   MarkdownAdapter,
 } from '@blocksuite/affine-shared/adapters';
-import { Container } from '@blocksuite/global/di';
 import type {
   BlockSnapshot,
   DocSnapshot,
@@ -21,20 +16,11 @@ import type {
 import { AssetsManager, MemoryBlobCRUD } from '@blocksuite/store';
 import { describe, expect, test } from 'vitest';
 
-import { defaultBlockMarkdownAdapterMatchers } from '../../_common/adapters/markdown/block-matcher.js';
 import { createJob } from '../utils/create-job.js';
+import { getProvider } from '../utils/get-provider.js';
 import { nanoidReplacement } from '../utils/nanoid-replacement.js';
 
-const container = new Container();
-[
-  ...MarkdownInlineToDeltaAdapterExtensions,
-  ...defaultBlockMarkdownAdapterMatchers,
-  ...InlineDeltaToMarkdownAdapterExtensions,
-].forEach(ext => {
-  ext.setup(container);
-});
-
-const provider = container.provider();
+const provider = getProvider();
 
 describe('snapshot to markdown', () => {
   test('code', async () => {

blocksuite/blocks/src/__tests__/adapters/notion-html.unit.spec.ts

@@ -1,7 +1,5 @@
-import { NotionHtmlInlineToDeltaAdapterExtensions } from '@blocksuite/affine-components/rich-text';
 import { DefaultTheme, NoteDisplayMode } from '@blocksuite/affine-model';
 import { NotionHtmlAdapter } from '@blocksuite/affine-shared/adapters';
-import { Container } from '@blocksuite/global/di';
 import {
   AssetsManager,
   type BlockSnapshot,
@@ -9,19 +7,11 @@ import {
 } from '@blocksuite/store';
 import { describe, expect, test } from 'vitest';
 
-import { defaultBlockNotionHtmlAdapterMatchers } from '../../_common/adapters/notion-html/block-matcher.js';
 import { createJob } from '../utils/create-job.js';
+import { getProvider } from '../utils/get-provider.js';
 import { nanoidReplacement } from '../utils/nanoid-replacement.js';
 
-const container = new Container();
-[
-  ...NotionHtmlInlineToDeltaAdapterExtensions,
-  ...defaultBlockNotionHtmlAdapterMatchers,
-].forEach(ext => {
-  ext.setup(container);
-});
-
-const provider = container.provider();
+const provider = getProvider();
 
 describe('notion html to snapshot', () => {
   test('code', async () => {

blocksuite/blocks/src/__tests__/adapters/plain-text.unit.spec.ts

@@ -1,10 +1,8 @@
-import { InlineDeltaToPlainTextAdapterExtensions } from '@blocksuite/affine-components/rich-text';
 import { DefaultTheme, NoteDisplayMode } from '@blocksuite/affine-model';
 import {
   embedSyncedDocMiddleware,
   PlainTextAdapter,
 } from '@blocksuite/affine-shared/adapters';
-import { Container } from '@blocksuite/global/di';
 import type {
   BlockSnapshot,
   DocSnapshot,
@@ -12,17 +10,10 @@ import type {
 } from '@blocksuite/store';
 import { describe, expect, test } from 'vitest';
 
-import { defaultBlockPlainTextAdapterMatchers } from '../../_common/adapters/plain-text/block-matcher.js';
 import { createJob } from '../utils/create-job.js';
+import { getProvider } from '../utils/get-provider.js';
 
-const container = new Container();
-[
-  ...defaultBlockPlainTextAdapterMatchers,
-  ...InlineDeltaToPlainTextAdapterExtensions,
-].forEach(ext => {
-  ext.setup(container);
-});
-const provider = container.provider();
+const provider = getProvider();
 
 describe('snapshot to plain text', () => {
   test('paragraph', async () => {

blocksuite/blocks/src/__tests__/utils/get-provider.ts

@@ -0,0 +1,15 @@
+import { SpecProvider } from '@blocksuite/affine-shared/utils';
+import { Container } from '@blocksuite/global/di';
+
+import { registerSpecs } from '../../extensions/register';
+
+registerSpecs();
+
+export function getProvider() {
+  const container = new Container();
+  const exts = SpecProvider._.getSpec('store').value;
+  exts.forEach(ext => {
+    ext.setup(container);
+  });
+  return container.provider();
+}