feat: 支持 OpenAI Responses API、Agent Node HITL 多轮交互及工具错误检测

[pcerypeng]

• OpenAIModel 新增 use_responses_api 参数，使用 client.responses.create 替代 Chat Completions
• 支持 responses_api_params 透传 store、reasoning、truncation 等待有参数
• AgentNodeAction 支持 LongRunningEvent 中断并传播到父 Graph
• 支持多轮 HITL 交互及服务重启后正确恢复
• 新增 is_tool_execution_error() 函数，区分 Provider 参数解析错误和 HITL 检查点
• 更新 Graph 和 Model 中英文文档
• 升级 openai 最低版本依赖至 1.66.0

[codecov]

Codecov Report

❌ Patch coverage is 89.70252% with 45 lines in your changes missing coverage. Please review.
⚠️ Please upload report for BASE (main@86781c7). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
trpc_agent_sdk/models/_openai_model.py	88.00000%	36 Missing ⚠️
trpc_agent_sdk/agents/_llm_agent.py	79.16667%	5 Missing ⚠️
trpc_agent_sdk/dsl/graph/_node_action/_agent.py	96.20253%	3 Missing ⚠️
trpc_agent_sdk/tools/_long_running_tool.py	83.33333%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main        #227   +/-   ##
==========================================
  Coverage        ?   87.87212%           
==========================================
  Files           ?         482           
  Lines           ?       45416           
  Branches        ?           0           
==========================================
  Hits            ?       39908           
  Misses          ?        5508           
  Partials        ?           0           

☔ View full report in Codecov by Harness.
📢 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.

[github-actions]

CLA Assistant Lite bot:
Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

---

I have read the CLA Document and I hereby sign the CLA

---

_{You can retrigger this bot by commenting recheck in this Pull Request}