fix(conversation): 修复实时会话 TTS/回复被离屏 WS 抢占

- 列表预热仅预取消息缓存，避免后台 WebSocket 覆盖服务端连接
- RealtimeSession UI 回调按 owner 独占，防止 offscreen 覆盖聊天页
- 列表页聚焦时再 prewarm，会话页 TTS 入队优先 base64
- 管线下发 TTS 同时带 audio_base64 与 audio_url；协议说明同步
- 移除 TTS 排查用前后端调试日志，保留错误/告警
- 补充 WS / RealtimeSession / entry-warmup / 播放器相关单测

Co-authored-by: Cursor <cursoragent@cursor.com>

app-expo/tests/features/voice/use-player.test.tsx

@@ -37,6 +37,7 @@ describe('usePlayer', () => {
     });
     jest.mocked(audioFocus.acquireForPlayback).mockResolvedValue(true);
     jest.mocked(audioFocus.releaseIfOwnedBy).mockResolvedValue(undefined);
+    jest.mocked(audioFocus.onOwnerChange).mockImplementation(() => jest.fn());
   });
 
   test('keeps the native audio session active while app-level audio focus owns teardown', () => {
@@ -127,4 +128,43 @@ describe('usePlayer', () => {
     expect(pause).not.toHaveBeenCalled();
     expect(result.current.status).toBe('idle');
   });
+
+  test('retries queued audio after acquire fails once then audio focus frees', async () => {
+    const acquire = jest.mocked(audioFocus.acquireForPlayback);
+    acquire.mockResolvedValueOnce(false).mockResolvedValue(true);
+
+    let ownerListener: ((owner: null | string) => void) | undefined;
+    jest.mocked(audioFocus.onOwnerChange).mockImplementation((cb) => {
+      ownerListener = cb as (owner: null | string) => void;
+      return jest.fn();
+    });
+
+    mockUseAudioPlayerStatus.mockReturnValue({
+      isLoaded: true,
+      playing: false,
+      currentTime: 0,
+      duration: 10,
+    });
+    const play = jest.fn();
+    mockUseAudioPlayer.mockReturnValue({ pause: jest.fn(), play });
+
+    const { result } = renderHook(() => usePlayer());
+
+    await act(async () => {
+      await result.current.enqueue({
+        uri: 'file:///queued.mp3',
+        kind: 'tts_auto',
+      });
+    });
+
+    expect(acquire).toHaveBeenCalledTimes(1);
+    expect(result.current.status).toBe('idle');
+
+    await act(async () => {
+      ownerListener?.(null);
+    });
+
+    expect(acquire).toHaveBeenCalledTimes(2);
+    expect(play).toHaveBeenCalled();
+  });
 });