Kakaako Kitchen   If the food wasn't served on Styrofoam, this place the brainchild of celeb chef Russell Siu, of 3660 on the Rise would be just about perfect, offering upscale plate lunches made to order (from katsu to crab cakes), excellent baked goods, quality coffee and indoor-outdoor dining. Favorites include the corned-beef hash at breakfast, the loco moco at lunch and quick stir-fry or grilled specials for dinner.  Ward Centre, 1200 Ala Moana. 596-7488. 7 a.m.-9 p.m. Mondays-Thursdays; 7-10 p.m. Saturdays; 7-6 p.m. Sundays. AX, DC, JCB, MC, VS. No checks $.