feat: 添加上证所截图功能并优化股票数据获取

- 新增上证所网页元素截图功能，使用Playwright实现
- 优化股票数据获取方式，改用新浪财经JS接口
- 调整情感分析评分规则为7级分类
- 添加截图显示组件到主界面
- 更新依赖项，替换playwright为selenium

main.py

@@ -24,6 +24,7 @@ class BackendWorker(QObject):
     error_occurred = Signal(str)
     status_update = Signal(str)
     stock_data_fetched = Signal(str, float)  # 股票数据获取信号
+    sse_screenshot_fetched = Signal(str)  # 上证所截图获取信号
 
     def __init__(self, config_manager: ConfigManager, db_manager: DatabaseManager,
                  spider: SpiderManager, analyzer: LLMAnalyzer):
@@ -197,6 +198,21 @@ class BackendWorker(QObject):
         except Exception as e:
             logger.error(f"爬取股票数据失败: {str(e)}")
 
+    def fetch_sse_screenshot(self):
+        """爬取上证所网页元素截图"""
+        try:
+            logger.info("开始爬取上证所网页截图")
+            screenshot_path = self.spider.fetch_sse_screenshot()
+            
+            if screenshot_path:
+                logger.info(f"成功获取截图: {screenshot_path}")
+                self.sse_screenshot_fetched.emit(screenshot_path)
+            else:
+                logger.warning("未能获取有效的截图")
+                
+        except Exception as e:
+            logger.error(f"爬取截图失败: {str(e)}")
+
     def manual_refresh(self):
         """手动刷新"""
         logger.info("用户手动刷新")
@@ -283,6 +299,7 @@ def main():
     worker.analysis_finished.connect(window.update_indicator)
     worker.error_occurred.connect(lambda msg: window.show_message("错误", msg))
     worker.stock_data_fetched.connect(window.add_waveform_data)
+    worker.sse_screenshot_fetched.connect(window.update_sse_screenshot)
 
     # 启动时从数据库初始化指示器显示
     worker._update_indicator()
@@ -302,6 +319,12 @@ def main():
     stock_timer.start(60000)  # 每分钟爬取一次股票数据
     logger.info("股票数据爬取定时器已启动，间隔60秒")
 
+    # 启动上证所截图爬取定时器
+    screenshot_timer = QTimer()
+    screenshot_timer.timeout.connect(worker.fetch_sse_screenshot)
+    screenshot_timer.start(300000)  # 每5分钟爬取一次截图
+    logger.info("上证所截图爬取定时器已启动，间隔300秒")
+
     # 确保应用退出时清理线程
     def cleanup():
         logger.info("清理资源，停止后台线程...")