Module gemini 

Gemini Generate API 驱动 — 实现 Google Gemini 特有的请求/响应格式转换

Google Gemini generateContent API driver. Key differences:

• Uses contents instead of messages, with parts instead of content.
• Roles: user and model (not assistant). System uses system_instruction.
• generationConfig wraps temperature, max_tokens (→ maxOutputTokens), etc.
• Response: candidates[0].content.parts[0].text.
• Streaming uses NDJSON with the same structure (each line is a full response).
• API key is passed as ?key= query parameter, not in headers.

Structs

GeminiDriver

Google Gemini generateContent API driver.