fix seed for Prisma 7: use PrismaPg adapter instead of datasourceUrl

prisma/seed.ts

@@ -1,9 +1,11 @@
 import { PrismaClient, Role } from "@prisma/client";
+import { PrismaPg } from "@prisma/adapter-pg";
 import * as argon2 from "argon2";
 import { randomBytes } from "node:crypto";
 
 async function main(): Promise<void> {
-  const prisma = new PrismaClient();
+  const adapter = new PrismaPg({ connectionString: process.env.DATABASE_URL });
+  const prisma = new PrismaClient({ adapter });
 
   const adminEmail = "admin@sso.local";
   const adminPassword = "admin123!";