admin: Superforms + Zod validation, three-address-defaults schema, profiles toast fix

- Add Superforms + Zod 4 for all admin form validation
- Replace address isDefault with three separate boolean defaults (Mailing, Billing, Shipping)
- Update profiles page with three-checkbox address form and toast improvements
- Convert all admin page server actions to pass request directly to crud
- Export superFormErrorsToFieldErrors helper for profiles server actions
- Regenerate Prisma client for new schema fields

src/routes/(protected)/admin/+page.server.ts

@@ -0,0 +1,7 @@
+import type { PageServerLoad } from './$types';
+import { getAllModelConfigs } from '$lib/svelte-admin/registry';
+
+export const load: PageServerLoad = async () => {
+	const models = getAllModelConfigs().filter((m) => m.slug !== 'license-keys');
+	return { models };
+};