Refactor admin to shared generic CRUD; restructure proclamation categories/groups and APIs

- Replace per-model admin forms with the shared generic AdminTable/AdminModal CRUD
- Add ProclamationGroup model and admin + API v2 routes (replaces subscription levels)
- Drop subscription levels and flatten proclamation categories
- Update v2 serializers and seed data accordingly

src/routes/(protected)/admin/users/+page.svelte

@@ -1,6 +1,5 @@
 <script lang="ts">
 	import type { PageProps } from './$types';
-	import type { ActionResult } from '$lib/svelte-admin/types';
 	import AdminTable from '$lib/components/admin/AdminTable.svelte';
 	import AdminModal from '$lib/components/admin/AdminModal.svelte';
 	import Toast from '$lib/components/admin/Toast.svelte';
@@ -15,7 +14,6 @@
 	let modalOpen = $state(false);
 	let editingRecord = $state<Record<string, unknown> | null>(null);
 	let toastMessage = $state('');
-	let toastType = $state<'success' | 'error'>('success');
 	let fieldErrors = $state<Record<string, string>>({});
 	let formError = $state('');
 
@@ -24,7 +22,6 @@
 			const result = form as any;
 			if (result.success) {
 				toastMessage = 'Saved successfully';
-				toastType = 'success';
 				closeModal();
 			} else {
 				formError = result.error ?? '';
@@ -55,8 +52,8 @@
 	}
 </script>
 
-<div class="p-6">
-	<h1 class="mb-4 text-xl font-bold text-gray-900 dark:text-gray-100">{config.displayName}</h1>
+<div>
+	<h1>{config.displayName}</h1>
 	<AdminTable
 		records={data.records}
 		listFields={config.listFields}
@@ -87,5 +84,5 @@
 </AdminModal>
 
 {#if toastMessage}
-	<Toast message={toastMessage} type={toastType} />
+	<Toast message={toastMessage} />
 {/if}