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/lib/auth-client.ts

@@ -1,3 +1,3 @@
-import { createAuthClient } from "better-auth/svelte"
+import { createAuthClient } from 'better-auth/svelte';
 
-export const authClient = createAuthClient({});
+export const authClient = createAuthClient({});