Add alias entity

pkg/cgnolink/alias/entity.go

@@ -0,0 +1,11 @@
+package alias
+
+import "time"
+
+type Alias struct {
+	Id           string
+	LinkId       int64
+	CreationTime time.Time
+}
+
+type Aliases = []*Alias

pkg/cgnolink/link/entity.go

@@ -6,7 +6,7 @@ import (
 )
 
 type Link struct {
-	Id           string
+	Id           int64
 	Name         string
 	RedirectURL  url.URL
 	Password     string