fix(v2ex): fetch hot topics through browser context

[huguoliang1314]

Summary

• switch v2ex hot from direct non-browser fetch to browser-context API access
• open a normal V2EX page first, then fetch /api/topics/hot.json inside the page context
• avoid coupling the command to the API page rendering details

Why

V2EX is rate-limiting or blocking direct API access from the non-browser path, while requests issued inside a real browser session still succeed.

Validation

• rebased onto latest origin/main
• reviewed the final YAML pipeline logic
• GitHub checks were not reported on this PR branch at review time

[huguoliang1314]

如题，解决v2ex热榜接口风控问题。
测试用例我看了，热榜问题已经解决。
其它几个错误，和我这边修改无关，应该是被风控了。
✓ v2ex hot returns topics ✅ (你的修改)
× v2ex latest returns topics ❌ (不是你的修改)
× bloomberg * (8个失败) ❌ (不是你的修改)
× imdb top ❌ (不是你的修改)