refactor: 移除交易时间检查逻辑并优化数据获取流程

- 删除 SpiderManager 和 WaveformWidget 中的 is_trading_time 方法及相关检查
- 在 BackendWorker 中添加截图获取步骤
- 更新波形图显示逻辑，移除非交易时间相关提示

waveform_widget.py

@@ -89,37 +89,10 @@ class WaveformWidget(QWidget):
             logger.error(f"时间转换错误: {time_str}, 错误: {e}")
             return total_width / 2  # 默认返回中间位置
 
-    def is_trading_time(self, time_str: str) -> bool:
-        """判断是否为交易时间"""
-        try:
-            current_time = datetime.strptime(time_str, "%H:%M").time()
-            
-            # 上午交易时间: 9:30-11:30
-            morning_start = time(9, 30)
-            morning_end = time(11, 30)
-            
-            # 下午交易时间: 13:00-15:00
-            afternoon_start = time(13, 0)
-            afternoon_end = time(15, 0)
-            
-            # 判断是否在交易时间内
-            is_trading = ((morning_start <= current_time <= morning_end) or 
-                         (afternoon_start <= current_time <= afternoon_end))
-            
-            logger.debug(f"时间 {time_str} 是否为交易时间: {is_trading}")
-            return is_trading
-            
-        except Exception as e:
-            logger.error(f"时间判断错误: {time_str}, 错误: {e}")
-            return False
+
 
     def add_data_point(self, time_str: str, value: float):
         """添加数据点"""
-        # 检查是否为交易时间
-        if not self.is_trading_time(time_str):
-            logger.info(f"非交易时间 {time_str}，跳过数据点添加")
-            return
-            
         # 如果是第一个数据点，设置基准值
         if not self.data_points:
             self.base_value = value
@@ -154,12 +127,6 @@ class WaveformWidget(QWidget):
         if not self.data_points:
             self._draw_no_data_message(painter, width, height)
             return
-            
-        # 检查最后一个数据点的时间是否为交易时间
-        last_time = self.data_points[-1][0] if self.data_points else ""
-        if last_time and not self.is_trading_time(last_time):
-            self._draw_non_trading_message(painter, width, height)
-            return
         
         # 绘制网格和坐标轴
         self._draw_grid(painter, width, height)
@@ -264,24 +231,12 @@ class WaveformWidget(QWidget):
         painter.setFont(font)
         
         # 绘制提示信息
-        message = "等待交易时间数据..."
+        message = "等待数据..."
         text_rect = painter.fontMetrics().boundingRect(message)
         x = (width - text_rect.width()) // 2
         y = height // 2
         
         painter.drawText(x, y, message)
-        
-        # 绘制交易时间说明
-        font.setPointSize(10)
-        font.setBold(False)
-        painter.setFont(font)
-        
-        info = "交易时间: 9:30-11:30, 13:00-15:00"
-        info_rect = painter.fontMetrics().boundingRect(info)
-        x_info = (width - info_rect.width()) // 2
-        y_info = y + 30
-        
-        painter.drawText(x_info, y_info, info)
 
     def _draw_non_trading_message(self, painter: QPainter, width: int, height: int):
         """绘制非交易时间提示信息或截图"""