fix seed for Prisma 7: remove datasourceUrl option

prisma/seed.ts

@@ -3,7 +3,7 @@ import * as argon2 from "argon2";
 import { randomBytes } from "node:crypto";
 
 async function main(): Promise<void> {
-  const prisma = new PrismaClient({ datasourceUrl: process.env.DATABASE_URL });
+  const prisma = new PrismaClient();
 
   const adminEmail = "admin@sso.local";
   const adminPassword = "admin123!";