feat: 新增写作画布系统

frontend-web/src/core/threads/types.ts

@@ -14,9 +14,11 @@ export interface AgentThreadContext extends Record<string, unknown> {
   model_name: string | undefined;
   thinking_enabled: boolean;
   is_plan_mode: boolean;
-  subagent_enabled: boolean;
-  reasoning_effort?: "minimal" | "low" | "medium" | "high";
-  agent_id?: string;
+  subagent_enabled: boolean;
+  reasoning_effort?: "minimal" | "low" | "medium" | "high";
+  writing_mode?: boolean;
+  writing_artifact_path?: string;
+  agent_id?: string;
   /** @deprecated kept for reading legacy thread metadata; prefer agent_id */
   agent_name?: string;
 }