feat: support structured output with json schema

[zuisong]

No description provided.

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Name	Status	Preview	Comments	Updated (UTC)
gemini-openai-proxy-vercel	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Feb 19, 2025 2:43am

[zuisong]

{
    "model": "gemini-2.0-flash",
    "messages": [
      {
        "role": "user",
        "content": "2026年，12月12日，晚上11点12分记录， 今天喝奶茶花了18元，打车用了12.2元, 买包子花了2元， 买水喝花了3元"
      }
    ],
    "response_format": {
      "type": "json_schema",
      "json_schema": {
        "name": "costcount",
        "schema": {
          "type": "object",
          "properties": {
            "costItems": {
              "type": "array",
              "items": {
                "type": "object",
                "properties": {
                  "item": {
                    "type": "string",
                    "description": "具体花费项目"
                  },
                  "price": {
                    "type": "number",
                    "description": "花费项金额"
                  },
                  "datetime": {
                    "type": "string",
                    "description": "花钱时间"
                  }
                }
              }
            }
          }
        }
      }
    },
    "stream": false
  }