feat: Support /v1/models API in ai-proxy

[CH3CHO]

Ⅰ. Describe what this PR did

Support /v1/models API in ai-proxy for following provider types:

• openai
• moonshot
• ollama

Ⅱ. Does this pull request fix one issue?

fixes #2117

Ⅲ. Why don't you add test cases (unit test/integration test)?

Ⅳ. Describe how to verify it

Ⅴ. Special notes for reviews

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.73%. Comparing base (ef31e09) to head (9e7acc5).
Report is 562 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2164      +/-   ##
==========================================
+ Coverage   35.91%   45.73%   +9.82%     
==========================================
  Files          69       79      +10     
  Lines       11576    12895    +1319     
==========================================
+ Hits         4157     5897    +1740     
+ Misses       7104     6651     -453     
- Partials      315      347      +32     

see 77 files with indirect coverage changes

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[johnlanni]

LGTM