feat: 支持连接用户已有的 Chrome 浏览器进行爬取

新增 CDP_CONNECT_EXISTING 配置项，默认开启，通过 Chrome 远程调试功能
(chrome://inspect/#remote-debugging) 直接连接用户正在使用的浏览器，
复用真实的 Cookie、扩展和浏览历史，大幅降低平台风控检测风险。

主要变更:
- 新增 _connect_existing_browser 方法，通过 ws:// 直接连接已有浏览器
- 支持等待用户在浏览器端确认连接对话框（60秒超时）
- cleanup 时不关闭用户的浏览器进程
- 修复小红书在真实浏览器下 cookie 过多导致签名失败的问题
- 更新 README、CDP使用指南和常见问题文档

uv.lock

@@ -1,4 +1,5 @@
 version = 1
+revision = 1
 requires-python = ">=3.11"
 resolution-markers = [
     "python_full_version >= '3.12' and sys_platform == 'darwin'",
@@ -863,6 +864,7 @@ dependencies = [
     { name = "uvicorn" },
     { name = "websockets" },
     { name = "wordcloud" },
+    { name = "xhshow" },
 ]
 
 [package.metadata]
@@ -900,6 +902,7 @@ requires-dist = [
     { name = "uvicorn", specifier = "==0.29.0" },
     { name = "websockets", specifier = ">=15.0.1" },
     { name = "wordcloud", specifier = "==1.9.3" },
+    { name = "xhshow", specifier = ">=0.1.9" },
 ]
 
 [[package]]
@@ -1159,6 +1162,36 @@ wheels = [
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 ]
 
+[[package]]
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+version = "3.23.0"
+source = { registry = "https://pypi.tuna.tsinghua.edu.cn/simple" }
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+]
+
 [[package]]
 name = "pydantic"
 version = "2.5.2"
@@ -1715,3 +1748,15 @@ wheels = [
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 ]
+
+[[package]]
+name = "xhshow"
+version = "0.1.9"
+source = { registry = "https://pypi.tuna.tsinghua.edu.cn/simple" }
+dependencies = [
+    { name = "pycryptodome" },
+]
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+wheels = [
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