feat: gemini audio input billing

setting/operation_setting/tools.go

@@ -14,6 +14,13 @@ const (
 	FileSearchPrice = 2.5
 )
 
+const (
+	// Gemini Audio Input Price
+	Gemini25FlashPreviewInputAudioPrice     = 1.00
+	Gemini25FlashNativeAudioInputAudioPrice = 3.00
+	Gemini20FlashInputAudioPrice            = 0.70
+)
+
 func GetWebSearchPricePerThousand(modelName string, contextSize string) float64 {
 	// 确定模型类型
 	// https://platform.openai.com/docs/pricing Web search 价格按模型类型和 search context size 收费
@@ -55,3 +62,14 @@ func GetWebSearchPricePerThousand(modelName string, contextSize string) float64
 func GetFileSearchPricePerThousand() float64 {
 	return FileSearchPrice
 }
+
+func GetGeminiInputAudioPricePerMillionTokens(modelName string) float64 {
+	if strings.HasPrefix(modelName, "gemini-2.5-flash-preview") {
+		return Gemini25FlashPreviewInputAudioPrice
+	} else if strings.HasPrefix(modelName, "gemini-2.5-flash-preview-native-audio") {
+		return Gemini25FlashNativeAudioInputAudioPrice
+	} else if strings.HasPrefix(modelName, "gemini-2.0-flash") {
+		return Gemini20FlashInputAudioPrice
+	}
+	return 0
+}