收紧生成任务轮询与资产读取路径

空生成任务列表不再保持四秒轮询

读取资源字节优先通过read-url直连OSS

保留read-bytes作为OSS读取失败兜底

更新资产导出与项目记忆文档口径

src/services/match3dGeneratedModelCache.test.ts

@@ -27,14 +27,29 @@ describe('match3dGeneratedModelCache', () => {
 
   test('预加载生成模型字节并复用本地缓存', async () => {
     setStoredAccessToken('test-access-token', { emit: false });
-    vi.spyOn(globalThis, 'fetch').mockResolvedValue(
-      new Response(new Uint8Array([103, 108, 84, 70]), {
-        status: 200,
-        headers: {
-          'Content-Type': 'model/gltf-binary',
-        },
-      }),
-    );
+    vi.spyOn(globalThis, 'fetch')
+      .mockResolvedValueOnce(
+        new Response(
+          JSON.stringify({
+            read: {
+              signedUrl: 'https://oss.example.com/model.glb',
+              expiresAt: new Date(Date.now() + 60_000).toISOString(),
+            },
+          }),
+          {
+            status: 200,
+            headers: { 'Content-Type': 'application/json' },
+          },
+        ),
+      )
+      .mockResolvedValueOnce(
+        new Response(new Uint8Array([103, 108, 84, 70]), {
+          status: 200,
+          headers: {
+            'Content-Type': 'model/gltf-binary',
+          },
+        }),
+      );
 
     await preloadMatch3DGeneratedModelAssets(
       [
@@ -61,7 +76,13 @@ describe('match3dGeneratedModelCache', () => {
     );
 
     expect(Array.from(new Uint8Array(bytes))).toEqual([103, 108, 84, 70]);
-    expect(globalThis.fetch).toHaveBeenCalledTimes(1);
+    expect(globalThis.fetch).toHaveBeenCalledTimes(2);
+    expect(String(vi.mocked(globalThis.fetch).mock.calls[0]?.[0])).toContain(
+      '/api/assets/read-url',
+    );
+    expect(String(vi.mocked(globalThis.fetch).mock.calls[1]?.[0])).toBe(
+      'https://oss.example.com/model.glb',
+    );
   });
 
   test('模型源列表会去重并兼容 modelObjectKey', () => {