chore: remove unused code

internal/utils/rand/rand.go

@@ -1,24 +0,0 @@
-package rand
-
-import (
-	"math/rand"
-	"time"
-)
-
-// Deprecated: this will be removed in the future.
-// 随机生成指定长度字符串
-func RandStr(n int) string {
-	seed := time.Now().UnixNano()
-	source := rand.NewSource(seed)
-	random := rand.New(source)
-
-	letters := []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789")
-
-	// 使用循环生成指定长度的字符串
-	result := make([]rune, n)
-	for i := range result {
-		result[i] = letters[random.Intn(len(letters))]
-	}
-
-	return string(result)
-}

internal/utils/xtime/time.go

@@ -13,9 +13,3 @@ func BeijingTimeStr() string {
 	// 格式化为字符串
 	return now.Format("2006-01-02 15:04:05")
 }
-
-func GetTimeAfter(d time.Duration) string {
-	t := time.Now().UTC()
-
-	return t.Add(d).Format("2006-01-02 15:04:05")
-}