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

main_window.py

@@ -153,15 +153,15 @@ class ConfigDialog(QDialog):
         layout.addRow("User Agent:", self.user_agent_edit)
         layout.addRow("刷新间隔(s):", self.interval_spin)
 
-        # Playwright目录配置
-        playwright_dir_layout = QHBoxLayout()
-        self.playwright_dir_edit = QLineEdit(spider_config.get('playwright_dir', ''))
-        self.playwright_dir_edit.setPlaceholderText("留空则自动查找Playwright浏览器")
-        self.playwright_browse_btn = QPushButton("浏览...")
-        self.playwright_browse_btn.clicked.connect(self._browse_playwright_dir)
-        playwright_dir_layout.addWidget(self.playwright_dir_edit)
-        playwright_dir_layout.addWidget(self.playwright_browse_btn)
-        layout.addRow("Playwright目录:", playwright_dir_layout)
+        # Chrome浏览器路径配置
+        chrome_path_layout = QHBoxLayout()
+        self.chrome_path_edit = QLineEdit(spider_config.get('chrome_path', ''))
+        self.chrome_path_edit.setPlaceholderText("留空则自动查找Chrome浏览器")
+        self.chrome_browse_btn = QPushButton("浏览...")
+        self.chrome_browse_btn.clicked.connect(self._browse_chrome_path)
+        chrome_path_layout.addWidget(self.chrome_path_edit)
+        chrome_path_layout.addWidget(self.chrome_browse_btn)
+        layout.addRow("Chrome路径:", chrome_path_layout)
 
         # UI 配置
         ui_config = self.config_manager.ui_config
@@ -196,16 +196,16 @@ class ConfigDialog(QDialog):
         button_box.rejected.connect(self.reject)
         layout.addRow(button_box)
 
-    def _browse_playwright_dir(self):
-        """浏览Playwright目录"""
-        directory = QFileDialog.getExistingDirectory(
+    def _browse_chrome_path(self):
+        """浏览Chrome路径"""
+        file_path, _ = QFileDialog.getOpenFileName(
             self,
-            "选择Playwright浏览器目录",
+            "选择Chrome浏览器可执行文件",
             "",
-            QFileDialog.ShowDirsOnly | QFileDialog.DontResolveSymlinks
+            "Chrome浏览器 (*.exe);;所有文件 (*.*)"
         )
-        if directory:
-            self.playwright_dir_edit.setText(directory)
+        if file_path:
+            self.chrome_path_edit.setText(file_path)
 
     def _save_config(self):
         """保存配置"""
@@ -223,7 +223,7 @@ class ConfigDialog(QDialog):
             xpath=self.xpath_edit.text(),
             user_agent=self.user_agent_edit.text(),
             fetch_interval=self.interval_spin.value(),
-            playwright_dir=self.playwright_dir_edit.text()
+            chrome_path=self.chrome_path_edit.text()
         )
 
         # UI