markers的时间粒度精确到秒，避免小时级数据出问题

chart.py

@@ -256,7 +256,7 @@ class QuantChart:
             if item["TD"] in [9, 13]:
                 markers.append(
                     {
-                        "time": item["time"].strftime("%Y-%m-%d"),
+                        "time": item["time"].strftime("%Y-%m-%d %H:%M:%S"),
                         "position": "above",
                         "shape": "arrow_down",
                         "color": "#00FF00",
@@ -266,7 +266,7 @@ class QuantChart:
             elif item["TD"] in [-9, -13]:
                 markers.append(
                     {
-                        "time": item["time"].strftime("%Y-%m-%d"),
+                        "time": item["time"].strftime("%Y-%m-%d %H:%M:%S"),
                         "position": "below",
                         "shape": "arrow_up",
                         "color": "#FF0000",