feat: 统一 AI 设计 Workspace 与生成任务链路

需求：以设计项目组织固定设计 Agent 对话、方向确认和图片视频任务。

实现：新增 Works Square 云端适配与开发态本地适配，统一 Host API、Quote 确认、任务轮询及私有媒体 Range 代理。

electron/api/context.ts

@@ -3,7 +3,7 @@ import type { OpencodeManager } from '../opencode/manager';
 import type { OpencodeProjectStore } from '../opencode/project-store';
 import type { HostEventBus } from './event-bus';
 import type { createWorksCloudDeployment } from '../services/works-cloud-deployment';
-import type { LocalImageWorkspace } from '../image-workspace/local-workspace';
+import type { DesignWorkspaceModule } from '../image-workspace/module';
 
 export type WorksCloudDeploymentCoordinator = ReturnType<typeof createWorksCloudDeployment>;
 
@@ -13,5 +13,5 @@ export interface HostApiContext {
   eventBus: HostEventBus;
   mainWindow: BrowserWindow | null;
   worksCloudDeployment?: WorksCloudDeploymentCoordinator;
-  imageWorkspace?: LocalImageWorkspace;
+  imageWorkspace?: DesignWorkspaceModule;
 }