feat: groundwork for 'living the dream' mii submissions

Based on the screenshots from yesterday's Nintendo Direct, it is
presumed that the Mii editor in "Living the Dream" is similar to
Miitopia's one.

This commit lays the groundwork for Miis created in the sequel game.
However, due to the way TomodachiShare generates portraits of the Miis,
I can't do that unless there is a way to parse the QR code data and
render the Mii.

Note: I don't know if Nintendo will use access codes (as was the case
with Miitopia) therefore, as a precaution, another branch will be
created in anticipation for that.

prisma/migrations/20250913120915_switch_sequel/migration.sql

@@ -0,0 +1,9 @@
+-- CreateEnum
+CREATE TYPE "public"."MiiPlatform" AS ENUM ('SWITCH', 'THREE_DS');
+
+-- AlterTable
+ALTER TABLE "public"."miis" ADD COLUMN     "platform" "public"."MiiPlatform" NOT NULL DEFAULT 'THREE_DS',
+ALTER COLUMN "firstName" DROP NOT NULL,
+ALTER COLUMN "lastName" DROP NOT NULL,
+ALTER COLUMN "islandName" DROP NOT NULL,
+ALTER COLUMN "allowedCopying" DROP NOT NULL;