feat: enhance OaiResponsesStreamHandler to handle output text and improve response streaming

relay/helper/common.go

@@ -43,6 +43,14 @@ func ClaudeChunkData(c *gin.Context, resp dto.ClaudeResponse, data string) {
 	}
 }
 
+func ResponseChunkData(c *gin.Context, resp dto.ResponsesStreamResponse, data string) {
+	c.Render(-1, common.CustomEvent{Data: fmt.Sprintf("event: %s\n", resp.Type)})
+	c.Render(-1, common.CustomEvent{Data: fmt.Sprintf("data: %s\n", data)})
+	if flusher, ok := c.Writer.(http.Flusher); ok {
+		flusher.Flush()
+	}
+}
+
 func StringData(c *gin.Context, str string) error {
 	//str = strings.TrimPrefix(str, "data: ")
 	//str = strings.TrimSuffix(str, "\r")