为所有函数和类添加中文注释文档字符串

app/diagnostics/perf_timer.py

@@ -5,28 +5,33 @@ from contextlib import contextmanager
 
 from loguru import logger
 
-
 class PerfTimer:
+    """性能计时器，用于测量代码段执行耗时"""
+
     def __init__(self, name: str = "") -> None:
         self.name = name
         self._start = 0.0
         self._elapsed = 0.0
 
     def start(self) -> PerfTimer:
+        """启动计时器"""
         self._start = time.perf_counter()
         return self
 
     def stop(self) -> float:
+        """停止计时器并返回耗时（秒）"""
         self._elapsed = time.perf_counter() - self._start
         return self._elapsed
 
     @property
     def elapsed_ms(self) -> float:
+        """返回已记录耗时（毫秒）"""
         return self._elapsed * 1000
 
 
 @contextmanager
 def measure(name: str = ""):
+    """上下文管理器：进入时计时，退出时记录耗时日志"""
     timer = PerfTimer(name).start()
     yield timer
     elapsed = timer.stop()