refactor(editor): rename doc to store on block components (#12173)

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

## Summary by CodeRabbit

- **Refactor**
  - Unified internal data access by replacing all references from `doc` to `store` across all components, blocks, widgets, and utilities. This affects how readonly state, block operations, and service retrieval are handled throughout the application.
- **Tests**
  - Updated all test utilities and test cases to use `store` instead of `doc` for document-related operations.
- **Chores**
  - Updated context providers and property names to reflect the change from `doc` to `store` for improved consistency and maintainability.

No user-facing features or behaviors have changed.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

blocksuite/affine/widgets/slash-menu/src/widget.ts

@@ -76,7 +76,7 @@ export class AffineSlashMenuWidget extends WidgetComponent {
     const textSelection = this.host.selection.find(TextSelection);
     if (!textSelection) return;
 
-    const model = this.host.doc.getBlock(textSelection.blockId)?.model;
+    const model = this.host.store.getBlock(textSelection.blockId)?.model;
     if (!model) return;
 
     return getInlineEditorByModel(this.std, model);