feat(server): attachment embedding (#13348)

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

* **New Features**
* Added support for managing "blobs" in Copilot context, including
adding and removing blobs via new GraphQL mutations and UI fields.
* Introduced tracking and querying of blob embeddings within workspaces,
enabling search and similarity matching for blob content.
* Extended Copilot context and workspace APIs, schema, and UI to display
and manage blobs alongside existing documents and files.

* **Bug Fixes**
* Updated context and embedding status logic to handle blobs, ensuring
accurate status reporting and embedding management.

* **Tests**
* Added and updated test cases and snapshots to cover blob embedding
insertion, matching, and removal scenarios.

* **Documentation**
* Updated GraphQL schema and TypeScript types to reflect new
blob-related fields and mutations.

* **Chores**
* Refactored and cleaned up code to support new blob entity and
embedding logic, including renaming and updating internal methods and
types.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

packages/frontend/core/src/blocksuite/ai/components/ai-chat-composer/ai-chat-composer.ts

@@ -11,7 +11,6 @@ import type {
   CopilotChatHistoryFragment,
   CopilotContextDoc,
   CopilotContextFile,
-  CopilotDocType,
 } from '@affine/graphql';
 import { SignalWatcher, WithDisposable } from '@blocksuite/affine/global/lit';
 import type { EditorHost } from '@blocksuite/affine/std';
@@ -270,7 +269,6 @@ export class AIChatComposer extends SignalWatcher(
     const docChips: DocChip[] = docs.map(doc => ({
       docId: doc.id,
       state: doc.status || 'processing',
-      tooltip: doc.error,
       createdAt: doc.createdAt,
     }));
 
@@ -583,10 +581,7 @@ export class AIChatComposer extends SignalWatcher(
       ...tags.flatMap(tag => tag.docs),
       ...collections.flatMap(collection => collection.docs),
     ];
-    const hashMap = new Map<
-      string,
-      CopilotContextDoc | CopilotDocType | CopilotContextFile
-    >();
+    const hashMap = new Map<string, CopilotContextDoc | CopilotContextFile>();
     const count: Record<ContextEmbedStatus, number> = {
       finished: 0,
       processing: 0,