合并 AI 设计多会话客户端

整合 Enter 发送与多会话交互，保留服务端持久 Conversation Session，并补齐迁移、回归、Electron E2E 与 canonical 文档。

tests/unit/image-workspace-api.test.ts

@@ -8,8 +8,10 @@ import {
 } from '@/lib/host-api';
 import {
   confirmImageWorkspaceGeneration,
+  createImageWorkspaceConversation,
   createImageWorkspaceProject,
   fetchImageWorkspace,
+  fetchImageWorkspaceConversation,
   ImageWorkspaceApiError,
   openImageWorkspaceTaskEvents,
   resolveImageWorkspaceAssetUrl,
@@ -59,11 +61,11 @@ describe('AI design renderer API boundary', () => {
   });
 
   it('opens task events only after the local Host API token is ready', async () => {
-    const source = await openImageWorkspaceTaskEvents('workspace/one');
+    const source = await openImageWorkspaceTaskEvents('workspace/one', 'conversation/one');
 
     expect(source).toBe(createHostEventSourceMock.mock.results[0].value);
     expect(createHostEventSourceMock).toHaveBeenCalledWith(
-      '/api/works/image-workspace/workspaces/workspace%2Fone/events',
+      '/api/works/image-workspace/workspaces/workspace%2Fone/conversations/conversation%2Fone/events',
     );
     expect(ensureHostApiTokenMock.mock.invocationCallOrder[0])
       .toBeLessThan(createHostEventSourceMock.mock.invocationCallOrder[0]);
@@ -81,16 +83,43 @@ describe('AI design renderer API boundary', () => {
     });
   });
 
+  it('creates and reads Conversations through encoded Main-owned routes', async () => {
+    await createImageWorkspaceConversation(
+      'workspace/one',
+      '  第二会话  ',
+      'client-conversation-one',
+    );
+    await fetchImageWorkspaceConversation('workspace/one', 'conversation/one');
+
+    expect(hostApiFetchMock).toHaveBeenNthCalledWith(
+      1,
+      '/api/works/image-workspace/workspaces/workspace%2Fone/conversations',
+      {
+        method: 'POST',
+        body: JSON.stringify({
+          clientConversationId: 'client-conversation-one',
+          title: '第二会话',
+        }),
+      },
+    );
+    expect(hostApiFetchMock).toHaveBeenNthCalledWith(
+      2,
+      '/api/works/image-workspace/workspaces/workspace%2Fone/conversations/conversation%2Fone',
+      {},
+    );
+  });
+
   it('sends conversation turns with the current turn revision and no provider settings', async () => {
     await sendImageWorkspaceMessage(
       'workspace/one',
+      'conversation/one',
       4,
       '  继续调整构图  ',
       'turn-client-1',
     );
 
     const [path, init] = hostApiFetchMock.mock.calls[0];
-    expect(path).toBe('/api/works/image-workspace/workspaces/workspace%2Fone/messages');
+    expect(path).toBe('/api/works/image-workspace/workspaces/workspace%2Fone/conversations/conversation%2Fone/messages');
     expect(init).toMatchObject({ method: 'POST' });
     expect(JSON.parse(String(init?.body))).toMatchObject({
       expectedTurnRevision: 4,
@@ -104,6 +133,7 @@ describe('AI design renderer API boundary', () => {
   it('sends the selected first-frame Asset id with the conversation turn', async () => {
     await sendImageWorkspaceMessage(
       'workspace-one',
+      'conversation-one',
       5,
       '使用作品图片作为视频首帧',
       'turn-first-frame',
@@ -148,11 +178,11 @@ describe('AI design renderer API boundary', () => {
   });
 
   it('confirms a Quote through a separate structured action route', async () => {
-    await confirmImageWorkspaceGeneration('workspace-one', 5, 'quote/one');
+    await confirmImageWorkspaceGeneration('workspace-one', 'conversation-one', 5, 'quote/one');
 
     const [path, init] = hostApiFetchMock.mock.calls[0];
     expect(path).toBe(
-      '/api/works/image-workspace/workspaces/workspace-one/quotes/quote%2Fone/confirm',
+      '/api/works/image-workspace/workspaces/workspace-one/conversations/conversation-one/quotes/quote%2Fone/confirm',
     );
     expect(JSON.parse(String(init?.body))).toMatchObject({
       expectedTurnRevision: 5,