fix: changeoptional field to pointer type (#1907)

* fix:修复在渠道配置中设置模型重定向时，temperature为0被忽略的问题

* fix: set optional fields to pointer type

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Co-authored-by: JustSong <songquanpeng@foxmail.com>

relay/adaptor/zhipu/model.go

@@ -12,8 +12,8 @@ type Message struct {
 
 type Request struct {
 	Prompt      []Message `json:"prompt"`
-	Temperature float64   `json:"temperature,omitempty"`
-	TopP        float64   `json:"top_p,omitempty"`
+	Temperature *float64  `json:"temperature,omitempty"`
+	TopP        *float64  `json:"top_p,omitempty"`
 	RequestId   string    `json:"request_id,omitempty"`
 	Incremental bool      `json:"incremental,omitempty"`
 }