feat: 修复重试后请求结构混乱，修复rerank端点无法使用

relay/helper/model_mapped.go

@@ -4,15 +4,12 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"one-api/dto"
-	common2 "one-api/logger"
-	"one-api/relay/common"
-	"one-api/types"
-
 	"github.com/gin-gonic/gin"
+	"one-api/dto"
+	"one-api/relay/common"
 )
 
-func ModelMappedHelper(c *gin.Context, info *common.RelayInfo, request any) error {
+func ModelMappedHelper(c *gin.Context, info *common.RelayInfo, request dto.Request) error {
 	// map model name
 	modelMapping := c.GetString("model_mapping")
 	if modelMapping != "" && modelMapping != "{}" {
@@ -54,40 +51,7 @@ func ModelMappedHelper(c *gin.Context, info *common.RelayInfo, request any) erro
 		}
 	}
 	if request != nil {
-		switch info.RelayFormat {
-		case types.RelayFormatGemini:
-			// Gemini 模型映射
-		case types.RelayFormatClaude:
-			if claudeRequest, ok := request.(*dto.ClaudeRequest); ok {
-				claudeRequest.Model = info.UpstreamModelName
-			}
-		case types.RelayFormatOpenAIResponses:
-			if openAIResponsesRequest, ok := request.(*dto.OpenAIResponsesRequest); ok {
-				openAIResponsesRequest.Model = info.UpstreamModelName
-			}
-		case types.RelayFormatOpenAIAudio:
-			if openAIAudioRequest, ok := request.(*dto.AudioRequest); ok {
-				openAIAudioRequest.Model = info.UpstreamModelName
-			}
-		case types.RelayFormatOpenAIImage:
-			if imageRequest, ok := request.(*dto.ImageRequest); ok {
-				imageRequest.Model = info.UpstreamModelName
-			}
-		case types.RelayFormatRerank:
-			if rerankRequest, ok := request.(*dto.RerankRequest); ok {
-				rerankRequest.Model = info.UpstreamModelName
-			}
-		case types.RelayFormatEmbedding:
-			if embeddingRequest, ok := request.(*dto.EmbeddingRequest); ok {
-				embeddingRequest.Model = info.UpstreamModelName
-			}
-		default:
-			if openAIRequest, ok := request.(*dto.GeneralOpenAIRequest); ok {
-				openAIRequest.Model = info.UpstreamModelName
-			} else {
-				common2.LogWarn(c, fmt.Sprintf("model mapped but request type %T not supported", request))
-			}
-		}
+		request.SetModelName(info.UpstreamModelName)
 	}
 	return nil
 }