refactor(translator, executor): remove redundant bytes.Clone calls for improved performance

- Replaced all instances of `bytes.Clone` with direct references to enhance efficiency.
- Simplified payload handling across executors and translators by eliminating unnecessary data duplication.

internal/translator/antigravity/openai/responses/antigravity_openai-responses_request.go

@@ -1,14 +1,12 @@
 package responses
 
 import (
-	"bytes"
-
 	. "github.com/router-for-me/CLIProxyAPI/v6/internal/translator/antigravity/gemini"
 	. "github.com/router-for-me/CLIProxyAPI/v6/internal/translator/gemini/openai/responses"
 )
 
 func ConvertOpenAIResponsesRequestToAntigravity(modelName string, inputRawJSON []byte, stream bool) []byte {
-	rawJSON := bytes.Clone(inputRawJSON)
+	rawJSON := inputRawJSON
 	rawJSON = ConvertOpenAIResponsesRequestToGemini(modelName, rawJSON, stream)
 	return ConvertGeminiRequestToAntigravity(modelName, rawJSON, stream)
 }