refactor: 将多个 fmt.Println 日志替换为 log.Printf，以统一日志输出格式并提升可读性

service/scoresaber/gen_picture.go

@@ -2,6 +2,7 @@ package scoresaber
 
 import (
 	"fmt"
+	"log"
 
 	"git.lxtend.com/qqbot/util"
 )
@@ -16,7 +17,7 @@ func GetSSPicture(qqId string) (outputImgName string) {
 	outputImgPath := util.GenTempFilePath(fmt.Sprintf("scoresaber_%s.png", ssId))
 	outputImgName = fmt.Sprintf("scoresaber_%s.png", ssId)
 	if err := util.ScreenshotURL(url, outputImgPath, 1420, 2080, 50, 400, 150, 150, ""); err != nil {
-		fmt.Println(err)
+		log.Printf("ScreenshotURL error: %v\n", err)
 		return ""
 	}