support default value

[rinfx]

ai统计插件更新：

• 支持设置默认值
• 兼容部分框架响应body无模型问题，例如 bladeLLM

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 43.36%. Comparing base (ef31e09) to head (a46edd4).
Report is 341 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1873      +/-   ##
==========================================
+ Coverage   35.91%   43.36%   +7.45%     
==========================================
  Files          69       76       +7     
  Lines       11576    12301     +725     
==========================================
+ Hits         4157     5334    +1177     
+ Misses       7104     6633     -471     
- Partials      315      334      +19     

see 71 files with indirect coverage changes

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[CH3CHO]

LGTM