fix: convert system message to user message (close #328)

controller/relay-baidu.go

@@ -57,11 +57,22 @@ type BaiduChatStreamResponse struct {
 func requestOpenAI2Baidu(request GeneralOpenAIRequest) *BaiduChatRequest {
 	messages := make([]BaiduMessage, 0, len(request.Messages))
 	for _, message := range request.Messages {
+		if message.Role == "system" {
+			messages = append(messages, BaiduMessage{
+				Role:    "user",
+				Content: message.Content,
+			})
+			messages = append(messages, BaiduMessage{
+				Role:    "assistant",
+				Content: "Okay",
+			})
+		} else {
 			messages = append(messages, BaiduMessage{
 				Role:    message.Role,
 				Content: message.Content,
 			})
 		}
+	}
 	return &BaiduChatRequest{
 		Messages: messages,
 		Stream:   request.Stream,