fix: 避免复用浏览器时跨域 Cookie 过长导致请求失败

连接已有 Chrome 会把整个浏览器上下文的 cookie 带入平台 client。
除 xhs 外，多数平台仍直接读取全量 cookies，导致请求头过长并放大跨域污染。
本次将各平台的 cookie 读取统一收口到平台域名，并补上基础回归测试。

Constraint: 必须继续复用用户真实浏览器里的平台登录态
Rejected: 仅修复 xhs | 其他平台在连接已有浏览器时仍会携带超长 Cookie
Confidence: high
Scope-risk: moderate
Reversibility: clean
Directive: 后续新增平台或调整 update_cookies 和 create client 流程时，只按平台域名读取 cookies
Tested: uv run pytest test/test_utils.py; python3 -m compileall tools/crawler_util.py media_platform/douyin/core.py media_platform/douyin/client.py media_platform/kuaishou/core.py media_platform/kuaishou/client.py media_platform/bilibili/core.py media_platform/bilibili/client.py media_platform/zhihu/core.py media_platform/zhihu/client.py media_platform/tieba/core.py media_platform/tieba/client.py media_platform/xhs/core.py media_platform/xhs/client.py media_platform/weibo/core.py media_platform/weibo/client.py test/test_utils.py
Not-tested: 各平台在真实 CDP 浏览器连接下的端到端抓取流程

media_platform/weibo/core.py

@@ -60,6 +60,7 @@ class WeiboCrawler(AbstractCrawler):
     def __init__(self):
         self.index_url = "https://www.weibo.com"
         self.mobile_index_url = "https://m.weibo.cn"
+        self.cookie_urls = [self.mobile_index_url]
         self.user_agent = utils.get_user_agent()
         self.mobile_user_agent = utils.get_mobile_user_agent()
         self.cdp_manager = None
@@ -116,7 +117,7 @@ class WeiboCrawler(AbstractCrawler):
                 # Only get mobile cookies to avoid confusion between PC and mobile cookies
                 await self.wb_client.update_cookies(
                     browser_context=self.browser_context,
-                    urls=[self.mobile_index_url]
+                    urls=self.cookie_urls,
                 )
 
             crawler_type_var.set(config.CRAWLER_TYPE)
@@ -338,7 +339,10 @@ class WeiboCrawler(AbstractCrawler):
     async def create_weibo_client(self, httpx_proxy: Optional[str]) -> WeiboClient:
         """Create xhs client"""
         utils.logger.info("[WeiboCrawler.create_weibo_client] Begin create weibo API client ...")
-        cookie_str, cookie_dict = utils.convert_cookies(await self.browser_context.cookies(urls=[self.mobile_index_url]))
+        cookie_str, cookie_dict = await utils.convert_browser_context_cookies(
+            self.browser_context,
+            urls=self.cookie_urls,
+        )
         weibo_client_obj = WeiboClient(
             proxy=httpx_proxy,
             headers={