feat: 支持图片补全倍率计费并新增 Gemini 3 预览模型定价[#3426]

[asjfoajs]

• 引入 ImageCompletionRatio 计费项，支持对补全响应中的图片 Token 进行独立加权计费
• 更新 postConsumeQuota 中的核心计算逻辑，通过以下方式应用图片倍率： // 对补全中的图片 Token 应用独立倍率处理 dCompletionTokens = dCompletionTokens.Sub(dCompletionImageTokens) dCompletionTokens = dCompletionTokens.Add(dCompletionImageTokens.Mul(dImageCompletionRatio)) completionQuota = dCompletionTokens.Mul(dCompletionRatio)

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