fix: 系统用户账号简单4位长度，密码简单6位

src/framework/utils/regular/regular.go

@@ -19,7 +19,7 @@ func ValidUsername(username string) bool {
 	if username == "" {
 		return false
 	}
-	pattern := `^[a-zA-Z][a-z0-9A-Z]{5,}`
+	pattern := `^.{4,}$` //`^[a-zA-Z][a-z0-9A-Z]{5,}`
 	match, err := regexp.MatchString(pattern, username)
 	if err != nil {
 		return false