feat(ai-proxy): add support for OpenAI Responses API

[iutx]

What this PR does / why we need it:

• Fix Missing body, will cause method like GET or DELETE.. error.
• Add new route and filters for handling Responses API requests- Implement context filter to extract user prompts from API input
• Update request path constants to include new Responses API endpoint- Add unit tests for new context filter functionality

Which issue(s) this PR fixes:

• Fixes #your-issue_number
• Erda Cloud Issue Link

Specified Reviewers:

/assign @sfwn

ChangeLog

Language	Changelog
🇺🇸 English	add support for OpenAI Responses API
🇨🇳 中文	支持 OpenAI Responses API

Need cherry-pick to release versions?

Add comment like /cherry-pick release/1.0 when this PR is merged.

For details on the cherry pick process, see the cherry pick requests section under CONTRIBUTING.md.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 15.17%. Comparing base (9ee67c6) to head (7c66b9b).
Report is 2 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #6513   +/-   ##
=======================================
  Coverage   15.16%   15.17%           
=======================================
  Files        3683     3683           
  Lines      377077   377077           
=======================================
+ Hits        57202    57209    +7     
+ Misses     314426   314417    -9     
- Partials     5449     5451    +2     

Flag	Coverage Δ
by-github-actions	15.17% <ø> (+<0.01%)	⬆️

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see 7 files with indirect coverage changes

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[sfwn]

/approve