feat: gemini image support edit

relay/helper/valid_request.go

@@ -141,6 +141,7 @@ func GetAndValidOpenAIImageRequest(c *gin.Context, relayMode int) (*dto.ImageReq
 			imageRequest.N = uint(common.String2Int(formData.Get("n")))
 			imageRequest.Quality = formData.Get("quality")
 			imageRequest.Size = formData.Get("size")
+			imageRequest.ResponseFormat = formData.Get("response_format")
 			if imageValue := formData.Get("image"); imageValue != "" {
 				imageRequest.Image, _ = json.Marshal(imageValue)
 			}