Update markdown and initial code

utils/timer.py

@@ -0,0 +1,49 @@
+import time
+import asyncio
+import ntplib
+from datetime import datetime
+
+class PrecisionTimer:
+    def __init__(self):
+        self.offset = 0 # 服务器时间 - 本地时间
+
+    def sync_time(self):
+        """
+        同步 NTP 时间，计算偏移量
+        """
+        try:
+            client = ntplib.NTPClient()
+            response = client.request('pool.ntp.org', version=3)
+            self.offset = response.tx_time - time.time()
+            print(f"时间同步完成，偏移量: {self.offset:.3f}s")
+        except Exception as e:
+            print(f"NTP同步失败: {e}，将使用系统时间")
+
+    def get_server_time(self):
+        return time.time() + self.offset
+
+    async def wait_until(self, target_time_str):
+        """
+        等待直到目标时间 (格式: 2026-02-01 10:00:00)
+        """
+        target_dt = datetime.strptime(target_time_str, "%Y-%m-%d %H:%M:%S")
+        target_timestamp = target_dt.timestamp()
+        
+        print(f"正在等待目标时间: {target_time_str}")
+        
+        while True:
+            current_time = self.get_server_time()
+            remaining = target_timestamp - current_time
+            
+            if remaining <= 0:
+                print("目标时间已到！触发抢购！")
+                break
+            
+            # 动态调整调整休眠时间以节省 CPU 并保持精度
+            if remaining > 1:
+                await asyncio.sleep(remaining - 0.5)
+            elif remaining > 0.1:
+                await asyncio.sleep(0.01)
+            else:
+                # 最后一刻进入忙等以获取最高精度
+                pass