feat: invitation accept screen and api

internal/domain/invite/inviteRepositoryInterface.go

@@ -1,7 +1,10 @@
 package invite
 
+import "time"
+
 type Repository interface {
 	Create(invite Invite) (Invite, error)
 	GetAll() []Invite
 	Delete(id uint32) error
+	MarkAccepted(id uint32, acceptedAt time.Time) error
 }