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/bilibili/client.py

@@ -60,6 +60,7 @@ class BilibiliClient(AbstractApiClient, ProxyRefreshMixin):
         self.timeout = timeout
         self.headers = headers
         self._host = "https://api.bilibili.com"
+        self.cookie_urls = ["https://www.bilibili.com"]
         self.playwright_page = playwright_page
         self.cookie_dict = cookie_dict
         # Initialize proxy pool (from ProxyRefreshMixin)
@@ -145,8 +146,11 @@ class BilibiliClient(AbstractApiClient, ProxyRefreshMixin):
             ping_flag = False
         return ping_flag
 
-    async def update_cookies(self, browser_context: BrowserContext):
-        cookie_str, cookie_dict = utils.convert_cookies(await browser_context.cookies())
+    async def update_cookies(self, browser_context: BrowserContext, urls: Optional[list[str]] = None):
+        cookie_str, cookie_dict = await utils.convert_browser_context_cookies(
+            browser_context,
+            urls=urls or self.cookie_urls,
+        )
         self.headers["Cookie"] = cookie_str
         self.cookie_dict = cookie_dict