refactor: 移除波形图组件并更新README文档

移除不再使用的波形图组件及相关代码，简化主窗口结构。同时全面更新README文档，详细描述项目功能、技术栈和使用说明，使其更加专业和完善。

main_window.py

@@ -10,8 +10,6 @@ from PySide6.QtGui import QFont, QColor, QPainter, QBrush, QPen, QIcon, QAction,
 from typing import Callable, Optional
 from loguru import logger
 
-from waveform_widget import WaveformWidget
-
 
 class SentimentIndicator(QWidget):
     """情感指示灯组件"""
@@ -263,10 +261,6 @@ class MainWindow(QWidget):
         status_font.setPointSize(10)
         self.status_label.setFont(status_font)
 
-        # 波形图组件
-        self.waveform_widget = WaveformWidget()
-        self.waveform_widget.setMinimumHeight(200)
-
         # 上证所截图显示
         screenshot_group = QGroupBox("上证所行情")
         screenshot_layout = QVBoxLayout(screenshot_group)
@@ -298,7 +292,6 @@ class MainWindow(QWidget):
         layout.addWidget(self.indicator)
         layout.addWidget(self.score_label)
         layout.addWidget(self.status_label)
-        layout.addWidget(self.waveform_widget)
         layout.addWidget(screenshot_group)
         layout.addLayout(btn_layout)
 
@@ -442,11 +435,6 @@ class MainWindow(QWidget):
         logger.info(f"显示消息: {title} - {message}")
         QMessageBox.information(self, title, message)
 
-    def add_waveform_data(self, time_str: str, value: float):
-        """添加波形图数据点"""
-        self.waveform_widget.add_data_point(time_str, value)
-        logger.info(f"添加波形图数据点: 时间={time_str}, 值={value}")
-
     def update_sse_screenshot(self, screenshot_path: str):
         """更新上证所截图显示"""
         logger.info(f"更新截图显示: {screenshot_path}")