接入编号讲解后端查询

- 使用真实讲解编号解析接口替换本地演示映射
- 成功后复用现有详情页并自动播放讲解
- 增加查询状态、业务错误提示和相关测试

Made-with: Proma

tests/unit/ExhibitDetailAudioFirst.spec.ts

@@ -256,6 +256,26 @@ describe('讲解详情音频优先布局', () => {
     }), expect.objectContaining({ displayMode: 'mini' }))
   })
 
+  it('编号入口加载详情后自动发起一次播放', async () => {
+    mount(ExhibitDetail, {
+      global: { stubs: { GuidePageFrame: GuidePageFrameStub } }
+    })
+
+    await mocks.onLoadHandler?.({
+      id: exhibit.id,
+      stopId: 'stop-1',
+      autoplay: '1',
+      entry: 'code'
+    })
+    await flushPromises()
+
+    expect(mocks.play).toHaveBeenCalledTimes(1)
+    expect(mocks.play).toHaveBeenCalledWith(
+      expect.objectContaining({ audioUrl: exhibit.audioUrl }),
+      expect.objectContaining({ displayMode: 'mini' })
+    )
+  })
+
   it('加载中使用同一高度底栏和不确定进度', async () => {
     audioState.currentAudio.value = { id: 'audio-1' }
     audioState.currentSource.value = { targetType: 'STOP', targetId: 'stop-1', lang: 'en-US' }