fix(server): nullable value for parent id (#10725)

packages/frontend/graphql/src/schema.ts

@@ -78,7 +78,6 @@ export interface Copilot {
   __typename?: 'Copilot';
   /** Get the context list of a session */
   contexts: Array<CopilotContext>;
-  docId: Maybe<Scalars['ID']['output']>;
   histories: Array<CopilotHistories>;
   /** Get the quota of the user in the workspace */
   quota: CopilotQuota;