fix: assign tenantId to superadmin in seed (column is NOT NULL)

packages/db/prisma/seed.ts

@@ -102,7 +102,7 @@ async function main() {
 
   // ─── Super Admin (platform-level, no tenant) ───────────
   const superAdmin = await prisma.user.create({
-    data: { tenantId: null, email: 'superadmin@fiberops.dev', password: await hashPassword('admin123!'), firstName: 'Super', lastName: 'Admin' },
+    data: { tenantId: tenant.id, email: 'superadmin@fiberops.dev', password: await hashPassword('admin123!'), firstName: 'Super', lastName: 'Admin' },
   });
   await prisma.userRole.create({ data: { userId: superAdmin.id, role: 'super_admin' } });
   console.log(`Super Admin: superadmin@fiberops.dev (super_admin)`);