feat(server): realtime notification & task status (#14934)

#### PR Dependency Tree


* **PR #14934** 👈

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

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

* **New Features**
* Full realtime platform added: live notifications, comments, embedding
progress, and transcription task updates via realtime subscriptions.

* **Chores**
* Frontend switched from polling/GraphQL queries to realtime channels;
legacy query fields marked deprecated and client libs updated to use
realtime APIs.

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/toeverything/AFFiNE/pull/14934)
<!-- end of auto-generated comment: release notes by coderabbit.ai -->


#### PR Dependency Tree


* **PR #14934** 👈
  * **PR #14936**

This tree was auto-generated by
[Charcoal](https://github.com/danerwilliams/charcoal)

packages/common/graphql/src/graphql/index.ts

@@ -1296,6 +1296,7 @@ export const getWorkspaceEmbeddingStatusQuery = {
     embedded
   }
 }`,
+  deprecations: ["'queryWorkspaceEmbeddingStatus' is deprecated: Use realtime subscription \"workspace.embedding.progress.changed\" instead."],
 };
 
 export const queueWorkspaceEmbeddingMutation = {
@@ -1621,6 +1622,7 @@ export const getTranscriptTaskQuery = {
     }
   }
 }`,
+  deprecations: ["'transcriptTask' is deprecated: Use realtime subscription \"copilot.transcript.task.changed\" instead."],
 };
 
 export const retryTranscriptTaskMutation = {
@@ -2646,11 +2648,10 @@ export const notificationCountQuery = {
   op: 'notificationCount',
   query: `query notificationCount {
   currentUser {
-    notifications(pagination: {first: 1}) {
-      totalCount
-    }
+    notificationCount
   }
 }`,
+  deprecations: ["'notificationCount' is deprecated: Use realtime subscription \"notification.count.changed\" instead."],
 };
 
 export const pricesQuery = {

packages/common/graphql/src/graphql/notification-count.gql

@@ -1,7 +1,5 @@
 query notificationCount {
   currentUser {
-    notifications(pagination: { first: 1 }) {
-      totalCount
-    }
+    notificationCount
   }
 }

packages/common/graphql/src/schema.ts

@@ -580,6 +580,7 @@ export interface Copilot {
    * @deprecated use `chats` instead
    */
   sessions: Array<CopilotSessionType>;
+  /** @deprecated Use realtime subscription "copilot.transcript.task.changed" instead. */
   transcriptTask: Maybe<TranscriptionResultType>;
   workspaceId: Maybe<Scalars['ID']['output']>;
 }
@@ -2635,7 +2636,10 @@ export interface Query {
   prices: Array<SubscriptionPrice>;
   /** Get public user by id */
   publicUserById: Maybe<PublicUserType>;
-  /** query workspace embedding status */
+  /**
+   * query workspace embedding status
+   * @deprecated Use realtime subscription "workspace.embedding.progress.changed" instead.
+   */
   queryWorkspaceEmbeddingStatus: ContextWorkspaceEmbeddingStatus;
   /** @deprecated use currentUser.revealedAccessTokens */
   revealedAccessTokens: Array<RevealedAccessToken>;
@@ -3390,7 +3394,10 @@ export interface UserType {
   invoices: Array<InvoiceType>;
   /** User name */
   name: Scalars['String']['output'];
-  /** Get user notification count */
+  /**
+   * Get user notification count
+   * @deprecated Use realtime subscription "notification.count.changed" instead.
+   */
   notificationCount: Scalars['Int']['output'];
   /** Get current user notifications */
   notifications: PaginatedNotificationObjectType;
@@ -7263,13 +7270,7 @@ export type NotificationCountQueryVariables = Exact<{ [key: string]: never }>;
 
 export type NotificationCountQuery = {
   __typename?: 'Query';
-  currentUser: {
-    __typename?: 'UserType';
-    notifications: {
-      __typename?: 'PaginatedNotificationObjectType';
-      totalCount: number;
-    };
-  } | null;
+  currentUser: { __typename?: 'UserType'; notificationCount: number } | null;
 };
 
 export type PricesQueryVariables = Exact<{ [key: string]: never }>;