fix: preserve explicit zero values in native relay requests

relay/channel/xai/adaptor.go

@@ -15,6 +15,7 @@ import (
 	"github.com/QuantumNous/new-api/relay/constant"
 
 	"github.com/gin-gonic/gin"
+	"github.com/samber/lo"
 )
 
 type Adaptor struct {
@@ -40,7 +41,7 @@ func (a *Adaptor) ConvertImageRequest(c *gin.Context, info *relaycommon.RelayInf
 	xaiRequest := ImageRequest{
 		Model:          request.Model,
 		Prompt:         request.Prompt,
-		N:              int(request.N),
+		N:              int(lo.FromPtrOr(request.N, uint(1))),
 		ResponseFormat: request.ResponseFormat,
 	}
 	return xaiRequest, nil
@@ -73,9 +74,9 @@ func (a *Adaptor) ConvertOpenAIRequest(c *gin.Context, info *relaycommon.RelayIn
 		return toMap, nil
 	}
 	if strings.HasPrefix(request.Model, "grok-3-mini") {
-		if request.MaxCompletionTokens == 0 && request.MaxTokens != 0 {
+		if lo.FromPtrOr(request.MaxCompletionTokens, uint(0)) == 0 && lo.FromPtrOr(request.MaxTokens, uint(0)) != 0 {
 			request.MaxCompletionTokens = request.MaxTokens
-			request.MaxTokens = 0
+			request.MaxTokens = lo.ToPtr(uint(0))
 		}
 		if strings.HasSuffix(request.Model, "-high") {
 			request.ReasoningEffort = "high"