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/subscription-levels/+page.svelte

@@ -0,0 +1,8 @@
+<script lang="ts">
+	import type { PageProps } from './$types';
+	import AdminPage from '$lib/components/admin/AdminPage.svelte';
+
+	let { data, form }: PageProps = $props();
+</script>
+
+<AdminPage modelSlug="subscription-levels" {data} {form} adminRoleId={data.adminUser?.roleId ?? 4} />