Rebuild admin pages around DataTable/AdminModal; restructure categories/groups and v2 groups API

Remove the generic $lib/svelte-admin CRUD layer and AdminTable.svelte; each
admin route now owns its own form/modal logic. Add DataTable.svelte,
superform-errors.ts, and profile-specific modal/field components.

Flatten proclamation categories/groups and drop subscription levels; add the
v2 groups API; update v1/v2 endpoints, serializers, auth, and regenerated
Prisma client with the new migrations.

Document the overhaul plan in docs/ADMIN_OVERHAUL.md.

docs/ai/testing-patterns.md

@@ -30,13 +30,13 @@ Tests are colocated with source files.
 
 Client tests:
 
-*.svelte.test.ts
-*.svelte.spec.ts
+_.svelte.test.ts
+_.svelte.spec.ts
 
 Server tests:
 
-*.test.ts
-*.spec.ts
+_.test.ts
+_.spec.ts
 
 ---
 
@@ -79,7 +79,7 @@ Node.
 Always reset mocks:
 
 beforeEach(() => {
-	vi.clearAllMocks();
+vi.clearAllMocks();
 });
 
 ---
@@ -109,15 +109,15 @@ Mock only the methods used.
 Example:
 
 vi.mock('$lib/db', () => ({
-	prisma: {
-		proclamation: {
-			findMany: vi.fn(),
-			findUnique: vi.fn(),
-			create: vi.fn(),
-			update: vi.fn(),
-			delete: vi.fn()
-		}
-	}
+prisma: {
+proclamation: {
+findMany: vi.fn(),
+findUnique: vi.fn(),
+create: vi.fn(),
+update: vi.fn(),
+delete: vi.fn()
+}
+}
 }));
 
 Do not create massive unused mocks.
@@ -143,7 +143,7 @@ createLocals(mockUser() as any)
 Specific roles:
 
 createLocals(
-	mockUser({ roleId: 4 }) as any
+mockUser({ roleId: 4 }) as any
 )
 
 ---
@@ -172,15 +172,15 @@ Always use exact regex names.
 Preferred:
 
 page.getByRole(
-	'textbox',
-	{ name: /^Name$/ }
+'textbox',
+{ name: /^Name$/ }
 )
 
 Avoid:
 
 page.getByRole(
-	'textbox',
-	{ name: 'Name' }
+'textbox',
+{ name: 'Name' }
 )
 
 because substring matching can create strict-mode failures.
@@ -192,15 +192,15 @@ because substring matching can create strict-mode failures.
 Because selects use selected options instead of bind:value:
 
 const element =
-	await page
-		.getByRole(
-			'combobox',
-			{ name: /^Frequency$/ }
-		)
-		.element();
+await page
+.getByRole(
+'combobox',
+{ name: /^Frequency$/ }
+)
+.element();
 
 expect(
-	(element as HTMLSelectElement).value
+(element as HTMLSelectElement).value
 ).toBe('2');
 
 ---
@@ -213,9 +213,9 @@ Use:
 
 vi.mock('$lib/components/example.svelte', () => ({
 	default: ($anchor: Element) => {
-		const div = document.createElement('div');
-		$anchor.replaceWith(div);
-	}
+const div = document.createElement('div');
+$anchor.replaceWith(div);
+}
 }));
 
 Imports using mocked modules must come after vi.mock().