fix: update OpenAI request fields to use json.RawMessage for dynamic data handling

relay/channel/coze/dto.go

@@ -17,7 +17,7 @@ type CozeEnterMessage struct {
 
 type CozeChatRequest struct {
 	BotId              string             `json:"bot_id"`
-	UserId             string             `json:"user_id"`
+	UserId             json.RawMessage    `json:"user_id"`
 	AdditionalMessages []CozeEnterMessage `json:"additional_messages,omitempty"`
 	Stream             bool               `json:"stream,omitempty"`
 	CustomVariables    json.RawMessage    `json:"custom_variables,omitempty"`

relay/channel/coze/relay-coze.go

@@ -34,8 +34,8 @@ func convertCozeChatRequest(c *gin.Context, request dto.GeneralOpenAIRequest) *C
 		}
 	}
 	user := request.User
-	if user == "" {
-		user = helper.GetResponseID(c)
+	if len(user) == 0 {
+		user = json.RawMessage(helper.GetResponseID(c))
 	}
 	cozeRequest := &CozeChatRequest{
 		BotId:              c.GetString("bot_id"),