feat(gemini): update audio input pricing and adjust model handling logic

relay/channel/gemini/relay-gemini.go

@@ -103,7 +103,6 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest, info *relaycommon
 		isNew25Pro := strings.HasPrefix(modelName, "gemini-2.5-pro") &&
 			!strings.HasPrefix(modelName, "gemini-2.5-pro-preview-05-06") &&
 			!strings.HasPrefix(modelName, "gemini-2.5-pro-preview-03-25")
-		is25FlashLite := strings.HasPrefix(modelName, "gemini-2.5-flash-lite")
 
 		if strings.Contains(modelName, "-thinking-") {
 			parts := strings.SplitN(modelName, "-thinking-", 2)
@@ -142,7 +141,7 @@ func CovertGemini2OpenAI(textRequest dto.GeneralOpenAIRequest, info *relaycommon
 				}
 			}
 		} else if strings.HasSuffix(modelName, "-nothinking") {
-			if !isNew25Pro && !is25FlashLite {
+			if !isNew25Pro {
 				geminiRequest.GenerationConfig.ThinkingConfig = &GeminiThinkingConfig{
 					ThinkingBudget: common.GetPointer(0),
 				}

setting/operation_setting/tools.go

@@ -17,6 +17,7 @@ const (
 const (
 	// Gemini Audio Input Price
 	Gemini25FlashPreviewInputAudioPrice     = 1.00
+	Gemini25FlashProductionInputAudioPrice  = 1.00 // for `gemini-2.5-flash`
 	Gemini25FlashNativeAudioInputAudioPrice = 3.00
 	Gemini20FlashInputAudioPrice            = 0.70
 )
@@ -64,10 +65,12 @@ func GetFileSearchPricePerThousand() float64 {
 }
 
 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") {
+	if strings.HasPrefix(modelName, "gemini-2.5-flash-preview-native-audio") {
 		return Gemini25FlashNativeAudioInputAudioPrice
+	} else if strings.HasPrefix(modelName, "gemini-2.5-flash-preview") {
+		return Gemini25FlashPreviewInputAudioPrice
+	} else if strings.HasPrefix(modelName, "gemini-2.5-flash") {
+		return Gemini25FlashProductionInputAudioPrice
 	} else if strings.HasPrefix(modelName, "gemini-2.0-flash") {
 		return Gemini20FlashInputAudioPrice
 	}