fix(route/zhihu): use /members/ API for org posts instead of deprecated /org/

[SWZ128]

Involved Issue / 该 PR 相关 Issue

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Example for the Proposed Route(s) / 路由地址示例

NOROUTE

New RSS Route Checklist / 新 RSS 路由检查表

• New Route
• Bug fix

Note / 说明

Problem / 问题

/zhihu/posts/org/:id returns 503. Root cause: zhihu's /api/v4/org/:id/articles endpoint is deprecated, org articles now all use /api/v4/members/:id/articles.
/zhihu/posts/org/:id 返回 503。根因：zhihu 的 /api/v4/org/:id/articles 端点已废弃，现在 org 类型文章统一走 /api/v4/members/:id/articles。

posts.ts L62 previously branched by usertype:
posts.ts L62 原来按 usertype 分叉：

• people → /api/v4/members/... ✓
• org → /api/v4/org/... ✗ (returns 404 / 返回 404)

Fix / 修复

Changed to always use /api/v4/members/....
改为统一 /api/v4/members/...。

Verification / 验证

Requires logged-in zhihu cookies (z_c0, d_c0, __zse_ck):
需要知乎登录后的 cookies（z_c0、d_c0、__zse_ck）：

ZHIHU_COOKIES='z_c0=<value>; d_c0=<value>; __zse_ck=<value>' npm run dev

# New terminal / 新终端测试
# org route (503 before, 200 after fix) / org 路由（修复前 503，修复后 200）
curl -so /dev/null -w "%{http_code}\n" http://localhost:1200/zhihu/posts/org/huo-rong-an-quan-shi-yan-shi

# people route (always 200, unaffected) / people 路由（始终 200，不受影响）
curl -so /dev/null -w "%{http_code}\n" http://localhost:1200/zhihu/posts/people/frederchen

people unaffected, org restored.
people 不受影响，org 恢复。

[github-actions]

Auto Route Test failed, please check your PR body format and reopen pull request. Check logs for more details.
自动路由测试失败，请确认 PR 正文部分符合格式规范并重新开启，详情请检查 日志。

[github-actions]

Auto Route Test failed, please check your PR body format and reopen pull request. Check logs for more details.
自动路由测试失败，请确认 PR 正文部分符合格式规范并重新开启，详情请检查 日志。

[TonyRL]

Already covered by #22319