Bug: opencli zhihu does not recognize logged-in state

[wii-me]

Describe the bug
When using opencli zhihu answer or comment, it fails to recognize the logged-in state.

Error Message

error:
  code: ACTION_NOT_AVAILABLE
  message: Could not resolve the logged-in Zhihu user identity before write
  exitCode: 1

Steps to Reproduce

1. Ensure logged into Zhihu.
2. Run opencli zhihu answer "URL" "text" --execute
3. See error.

Expected behavior
opencli should identify the user and post.

Environment:

• OS: Windows
• opencli version: 1.7.8

[Benjamin-eecs]

Fixed in #1207.

Root cause: Zhihu removed __INITIAL_STATE__ and moved the user avatar into a <button> instead of <a href="/people/...">, so resolveCurrentUserIdentity could not find the logged-in user slug.

The fix adds a fallback that extracts the slug from the header avatar's alt text. Additionally, the comment/answer/like/follow/favorite commands were rewritten to use Zhihu's API directly since the UI-based flows are broken by further DOM changes (Modal comment editor, Draft.js text insertion, hidden submit button).

All 9 zhihu commands tested and working on macOS with v1.7.8.