perf(video): 优化视频处理性能监控和音频播放

- 添加视频处理性能计时和统计功能
- 实现帧处理时间监控和慢帧警告
- 添加音频文件静音修剪功能
- 优化Windows平台音频播放实现
- 调整默认日志输出频率减少冗余信息
- 修复MediaPipe GPU委托在Windows上的兼容性问题

app/vision/pose_landmarker.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import platform
 from typing import Callable
 
 import mediapipe as mp
@@ -27,6 +28,11 @@ class PoseLandmarkerWrapper:
 
         if prefer_gpu:
             try:
+                if platform.system() == "Windows":
+                    logger.warning(
+                        "MediaPipe GPU delegate requested, but MediaPipe Tasks Python does not support GPU delegate on Windows; "
+                        "Intel Iris Xe cannot be used by this backend and CPU fallback is expected"
+                    )
                 self.delegate = BaseOptions.Delegate.GPU
                 self._landmarker = self._create(self.delegate, result_callback)
                 logger.info("MediaPipe PoseLandmarker initialized with GPU delegate")