refactor(embedding): remove zhipuai sdk and dependency for ZHIPU embeddings

[yuehong136]

What problem does this PR solve?

This PR removes the zhipuai Python SDK dependency from the ZHIPU embedding implementation and switches embedding calls to the official HTTP endpoint (/paas/v4/embeddings), reducing dependency overhead while keeping behavior unchanged.

Type of change

• Refactoring

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 44.05%. Comparing base (4bc622b) to head (478d157).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #13076      +/-   ##
==========================================
- Coverage   44.12%   44.05%   -0.07%     
==========================================
  Files          43       43              
  Lines        9394     9415      +21     
  Branches      107      107              
==========================================
+ Hits         4145     4148       +3     
- Misses       5230     5248      +18     
  Partials       19       19              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.

[asiroliu]

@yuehong136
Thank you very much for your PR. However, I believe moving away from the official Zhipu SDK in favor of a manual implementation is unnecessary and will make the code harder to maintain when the model changes in the future.