update api auth

src/util/auth.ts

@@ -0,0 +1,7 @@
+import { API_SECRET } from 'astro:env/server';
+
+const BASIC_AUTH_HEADER = API_SECRET ? `Basic ${Buffer.from(`api:${API_SECRET}`).toString('base64')}` : null;
+
+export function checkApiBasicAuth(headers: Headers) {
+  return BASIC_AUTH_HEADER ? headers.get('authorization') === BASIC_AUTH_HEADER : true;
+}