user creation and invites

prisma/migrations/20250624131750_add_username/migration.sql

@@ -0,0 +1,11 @@
+/*
+  Warnings:
+
+  - A unique constraint covering the columns `[username]` on the table `User` will be added. If there are existing duplicate values, this will fail.
+
+*/
+-- AlterTable
+ALTER TABLE "User" ADD COLUMN     "username" TEXT;
+
+-- CreateIndex
+CREATE UNIQUE INDEX "User_username_key" ON "User"("username");