refactor: move chat block to affine (#8368)

[BS-898](https://linear.app/affine-design/issue/BS-898/move-ai-chat-block-to-affine)

Should be merged after https://github.com/toeverything/blocksuite/pull/8420 merged and bumped.

packages/common/infra/src/blocksuite/blocks/ai-chat-block/ai-chat-model.ts

@@ -0,0 +1,48 @@
+import { GfxCompatible } from '@blocksuite/affine/block-std/gfx';
+import type { SerializedXYWH } from '@blocksuite/affine/global/utils';
+import { BlockModel, defineBlockSchema } from '@blocksuite/affine/store';
+
+type AIChatProps = {
+  xywh: SerializedXYWH;
+  index: string;
+  scale: number;
+  messages: string; // JSON string of ChatMessage[]
+  sessionId: string; // forked session id
+  rootWorkspaceId: string; // workspace id of root chat session
+  rootDocId: string; // doc id of root chat session
+};
+
+export const AIChatBlockSchema = defineBlockSchema({
+  flavour: 'affine:embed-ai-chat',
+  props: (): AIChatProps => ({
+    xywh: '[0,0,0,0]',
+    index: 'a0',
+    scale: 1,
+    messages: '',
+    sessionId: '',
+    rootWorkspaceId: '',
+    rootDocId: '',
+  }),
+  metadata: {
+    version: 1,
+    role: 'content',
+    children: [],
+  },
+  toModel: () => {
+    return new AIChatBlockModel();
+  },
+});
+
+export class AIChatBlockModel extends GfxCompatible<AIChatProps>(BlockModel) {}
+
+declare global {
+  // eslint-disable-next-line @typescript-eslint/no-namespace
+  namespace BlockSuite {
+    interface EdgelessBlockModelMap {
+      'affine:embed-ai-chat': AIChatBlockModel;
+    }
+    interface BlockModels {
+      'affine:embed-ai-chat': AIChatBlockModel;
+    }
+  }
+}

packages/common/infra/src/blocksuite/blocks/ai-chat-block/consts.ts

@@ -0,0 +1,2 @@
+export const CHAT_BLOCK_WIDTH = 300;
+export const CHAT_BLOCK_HEIGHT = 320;

packages/common/infra/src/blocksuite/blocks/ai-chat-block/index.ts

@@ -0,0 +1,3 @@
+export * from './ai-chat-model';
+export * from './consts';
+export * from './types';

packages/common/infra/src/blocksuite/blocks/ai-chat-block/types.ts

@@ -0,0 +1,25 @@
+import { z } from 'zod';
+
+// Define the Zod schema
+const ChatMessageSchema = z.object({
+  id: z.string(),
+  content: z.string(),
+  role: z.union([z.literal('user'), z.literal('assistant')]),
+  createdAt: z.string(),
+  attachments: z.array(z.string()).optional(),
+  userId: z.string().optional(),
+  userName: z.string().optional(),
+  avatarUrl: z.string().optional(),
+});
+
+export const ChatMessagesSchema = z.array(ChatMessageSchema);
+
+// Derive the TypeScript type from the Zod schema
+export type ChatMessage = z.infer<typeof ChatMessageSchema>;
+
+export type MessageRole = 'user' | 'assistant';
+export type MessageUserInfo = {
+  userId?: string;
+  userName?: string;
+  avatarUrl?: string;
+};

packages/common/infra/src/blocksuite/blocks/index.ts

@@ -0,0 +1 @@
+export * from './ai-chat-block';

packages/common/infra/src/blocksuite/index.ts

@@ -1,3 +1,4 @@
+export * from './blocks';
 export {
   migratePages as forceUpgradePages,
   migrateGuidCompatibility,