为所有函数和类添加中文注释文档字符串

app/webrtc/video_receiver.py

@@ -13,6 +13,7 @@ from configs.load import config
 
 
 def _format_pose_debug(pose_result) -> str:
+    """格式化姿态检测结果用于调试日志输出"""
     metrics = pose_result.metrics
     if metrics is None:
         return "metrics=None"
@@ -24,12 +25,14 @@ def _format_pose_debug(pose_result) -> str:
         f"ll={metrics.left_leg_extended}, rl={metrics.right_leg_extended})"
     )
 
-
 class VideoReceiver:
+    """视频轨道接收与运动检测流水线"""
+
     def __init__(self, track) -> None:
         self._track = track
 
     async def run(self) -> None:
+        """持续接收视频帧并进行姿态检测、渲染和语音播报"""
         logger.info("Start receiving video frames, process_every_n={}", config.video.process_every_n_frames)
 
         frame_count = 0