Fix missing display_name in membership status creation

The membership_statuses table requires display_name but the setup page
was not providing it when creating the initial Active status.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/routes/setup/+page.server.ts

@@ -123,6 +123,7 @@ export const actions: Actions = {
 				.from('membership_statuses')
 				.insert({
 					name: 'Active',
+					display_name: 'Active',
 					description: 'Active member in good standing',
 					is_default: false,
 					color: '#22c55e'