feat: game engine fetch battle api

game/internal/router/router_helper_test.go

@@ -68,6 +68,10 @@ func (e *dummyExecutor) FetchOrder(actor string, turn uint) (*order.UserGamesOrd
 	return e.FetchOrderResult, e.FetchOrderOK, e.FetchOrderErr
 }
 
+func (e *dummyExecutor) FetchBattle(turn uint, ID uuid.UUID) (*report.BattleReport, bool, error) {
+	return nil, false, nil
+}
+
 func (e *dummyExecutor) Execute(command ...handler.Command) error {
 	e.CommandsExecuted = len(command)
 	return nil