implement deletion of admin user, frontend and backend

src/routes/api/users/[user]/+server.ts

@@ -0,0 +1,13 @@
+import { json } from '@sveltejs/kit';
+import { deleteUser } from '$lib/server/userService';
+
+export async function DELETE({ params, locals }) {
+	if (!locals.user) {
+		return json({ error: 'Unauthorized' }, { status: 401 });
+	}
+
+	const userId = params.user;
+	const rowCount = deleteUser(userId);
+
+	return new Response(null, { status: rowCount == 1 ? 204 : 400 });
+}