Fix temperature not being set to 0 due to json omitempty

The issue was caused by the `omitempty` tag in the Go struct, which prevented the `temperature` field from being included in the JSON output when it was set to 0.

Signed-off-by: Butui Hu <hot123tea123@gmail.com>

relay/channel/tencent/relay-tencent.go

@@ -39,9 +39,7 @@ func requestOpenAI2Tencent(a *Adaptor, request dto.GeneralOpenAIRequest) *Tencen
 	if request.TopP != 0 {
 		req.TopP = &request.TopP
 	}
-	if request.Temperature != 0 {
-		req.Temperature = &request.Temperature
-	}
+	req.Temperature = request.Temperature
 	return &req
 }