feat(subscribe): add short token generation and validation logic

internal/types/types.go

@@ -2597,6 +2597,7 @@ type UserSubscribe struct {
 	Upload      int64     `json:"upload"`
 	Token       string    `json:"token"`
 	Status      uint8     `json:"status"`
+	Short       string    `json:"short"`
 	CreatedAt   int64     `json:"created_at"`
 	UpdatedAt   int64     `json:"updated_at"`
 }