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。

tests/unit/login-page.test.tsx

@@ -73,18 +73,15 @@ describe('Login page', () => {
       if (path === '/api/works/image-workspace') {
         return {
           success: true,
-          workspace: {
-            activeProjectId: null,
+          status: 200,
+          data: {
             capabilities: {
-              modes: [],
-              models: [],
-              aspectRatios: [],
-              resolutions: [],
-              outputCounts: [],
-              maxReferenceImages: 0,
-              referenceUpload: { enabled: false, acceptedMimeTypes: [] },
+              conversation: true,
+              generation: true,
+              image: true,
+              video: true,
             },
-            projects: [],
+            workspaces: [],
           },
         };
       }
@@ -97,7 +94,7 @@ describe('Login page', () => {
       </MemoryRouter>,
     );
 
-    expect(await screen.findByText('创建第一个项目')).toBeInTheDocument();
+    expect(await screen.findByText('创建第一个设计项目')).toBeInTheDocument();
     expect(screen.queryByText('本地开发')).not.toBeInTheDocument();
     expect(screen.queryByRole('button', { name: 'Continue in browser' })).not.toBeInTheDocument();
     unmount();