refactor(配置管理): 将playwright配置替换为chrome路径配置并更新使用说明

更新配置管理器、主窗口界面和使用说明文档，将原有的playwright目录配置改为chrome浏览器路径配置

config_manager.py

@@ -26,7 +26,7 @@ class ConfigManager:
             "fetch_interval": 60,
             "retry_times": 3,
             "retry_interval": 5,
-            "playwright_dir": ""
+            "chrome_path": ""
         },
         "ui": {
             "opacity": 0.9,
@@ -133,7 +133,7 @@ class ConfigManager:
     def update_spider(self, target_url: str = None, xpath: str = None,
                       user_agent: str = None, fetch_interval: int = None,
                       retry_times: int = None, retry_interval: int = None,
-                      playwright_dir: str = None):
+                      chrome_path: str = None):
         """更新爬虫配置"""
         if target_url:
             self.config["spider"]["target_url"] = target_url
@@ -147,8 +147,8 @@ class ConfigManager:
             self.config["spider"]["retry_times"] = retry_times
         if retry_interval:
             self.config["spider"]["retry_interval"] = retry_interval
-        if playwright_dir:
-            self.config["spider"]["playwright_dir"] = playwright_dir
+        if chrome_path:
+            self.config["spider"]["chrome_path"] = chrome_path
         logger.info("爬虫配置已更新")
         self.save_config()