fix: preserve explicit zero values in native relay requests

relay/channel/zhipu/adaptor.go

@@ -10,6 +10,7 @@ import (
 	"github.com/QuantumNous/new-api/relay/channel"
 	relaycommon "github.com/QuantumNous/new-api/relay/common"
 	"github.com/QuantumNous/new-api/types"
+	"github.com/samber/lo"
 
 	"github.com/gin-gonic/gin"
 )
@@ -60,8 +61,8 @@ 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/relay-zhipu.go

@@ -16,6 +16,7 @@ import (
 	"github.com/QuantumNous/new-api/relay/helper"
 	"github.com/QuantumNous/new-api/service"
 	"github.com/QuantumNous/new-api/types"
+	"github.com/samber/lo"
 
 	"github.com/gin-gonic/gin"
 	"github.com/golang-jwt/jwt/v5"
@@ -98,7 +99,7 @@ func requestOpenAI2Zhipu(request dto.GeneralOpenAIRequest) *ZhipuRequest {
 	return &ZhipuRequest{
 		Prompt:      messages,
 		Temperature: request.Temperature,
-		TopP:        request.TopP,
+		TopP:        lo.FromPtrOr(request.TopP, 0),
 		Incremental: false,
 	}
 }