Add deployment automation

supabase/seed.sql

@@ -0,0 +1,11 @@
+insert into shop_items (id, name, type, price, image_path)
+values
+  ('hat_blue', 'Blue Hat', 'accessory', 20, '/items/hat-blue.png'),
+  ('glasses_round', 'Round Glasses', 'accessory', 30, '/items/glasses-round.png'),
+  ('room_sunset', 'Sunset Room', 'background', 40, '/backgrounds/room-sunset.png')
+on conflict (id) do update
+set
+  name = excluded.name,
+  type = excluded.type,
+  price = excluded.price,
+  image_path = excluded.image_path;