refactor: update logging levels and remove unused code

common/os.go

@@ -9,20 +9,6 @@ import (
 	"github.com/krau/SaveAny-Bot/logger"
 )
 
-// 创建文件, 自动创建目录
-func MkFile(path string, data []byte) error {
-	err := os.MkdirAll(filepath.Dir(path), os.ModePerm)
-	if err != nil {
-		return err
-	}
-	return os.WriteFile(path, data, os.ModePerm)
-}
-
-func FileExists(path string) bool {
-	_, err := os.Stat(path)
-	return err == nil
-}
-
 // 删除文件, 并清理空目录. 如果文件不存在则返回 nil
 func PurgeFile(path string) error {
 	if err := os.Remove(path); err != nil {
@@ -60,24 +46,3 @@ func RemoveEmptyDirectories(dirPath string) error {
 	}
 	return nil
 }
-
-// 在指定时间后删除和清理文件 (定时器)
-func PurgeFileAfter(path string, td time.Duration) {
-	_, err := os.Stat(path)
-	if err != nil {
-		logger.L.Errorf("Failed to create timer for %s: %s", path, err)
-		return
-	}
-	logger.L.Debugf("Purge file after %s: %s", td, path)
-	time.AfterFunc(td, func() {
-		PurgeFile(path)
-	})
-}
-
-func MkCache(path string, data []byte, td time.Duration) {
-	if err := MkFile(path, data); err != nil {
-		logger.L.Errorf("failed to save cache file: %s", err)
-	} else {
-		go PurgeFileAfter(path, td)
-	}
-}