fix: preserve explicit zero values in native relay requests

relay/channel/zhipu_4v/adaptor.go

@@ -14,6 +14,7 @@ import (
 	relaycommon "github.com/QuantumNous/new-api/relay/common"
 	relayconstant "github.com/QuantumNous/new-api/relay/constant"
 	"github.com/QuantumNous/new-api/types"
+	"github.com/samber/lo"
 
 	"github.com/gin-gonic/gin"
 )
@@ -83,8 +84,8 @@ func (a *Adaptor) ConvertOpenAIRequest(c *gin.Context, info *relaycommon.RelayIn
 	if request == nil {
 		return nil, errors.New("request is nil")
 	}
-	if request.TopP >= 1 {
-		request.TopP = 0.99
+	if lo.FromPtrOr(request.TopP, 0) >= 1 {
+		request.TopP = lo.ToPtr(0.99)
 	}
 	return requestOpenAI2Zhipu(*request), nil
 }

relay/channel/zhipu_4v/relay-zhipu_v4.go

@@ -41,16 +41,20 @@ func requestOpenAI2Zhipu(request dto.GeneralOpenAIRequest) *dto.GeneralOpenAIReq
 	} else {
 		Stop, _ = request.Stop.([]string)
 	}
-	return &dto.GeneralOpenAIRequest{
+	out := &dto.GeneralOpenAIRequest{
 		Model:       request.Model,
 		Stream:      request.Stream,
 		Messages:    messages,
 		Temperature: request.Temperature,
 		TopP:        request.TopP,
-		MaxTokens:   request.GetMaxTokens(),
 		Stop:        Stop,
 		Tools:       request.Tools,
 		ToolChoice:  request.ToolChoice,
 		THINKING:    request.THINKING,
 	}
+	if request.MaxTokens != nil || request.MaxCompletionTokens != nil {
+		maxTokens := request.GetMaxTokens()
+		out.MaxTokens = &maxTokens
+	}
+	return out
 }