feat: add support for OpenAI structured output (response_format) #22
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- Add response_format parameter handling in FormatConverter - Convert OpenAI json_schema format to Gemini responseSchema - Support both json_schema and json_object modes - Extract convertParameterTypes helper for reuse - Add proper error handling and logging Fixes #11
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This pull request adds support for OpenAI's structured output feature (response_format parameter) by converting it to Gemini's responseSchema format. The implementation reuses and extends existing type conversion logic to handle both tool parameters and response schemas, with stricter validation rules for structured outputs.
此拉取请求通过将其转换为 Gemini 的 responseSchema 格式，增加了对 OpenAI 的结构化输出功能（response_format 参数）的支持。该实现重用并扩展了现有的类型转换逻辑，以处理工具参数和响应模式，并对结构化输出采用更严格的验证规则。
docs: https://ai.google.dev/gemini-api/docs/structured-output?example=recipe#structured_outputs_with_tools
Grounding and URL Context with Structured Outputs is allowed for gemini 3